diff --git a/Tests/AK/TestString.cpp b/Tests/AK/TestString.cpp
index 4d93637b23..9994fc16c8 100644
--- a/Tests/AK/TestString.cpp
+++ b/Tests/AK/TestString.cpp
@@ -98,8 +98,7 @@ TEST_CASE(long_streams)
         u8 bytes[64] = {};
         constexpr auto test_view = "Well, hello friends"sv;
         FixedMemoryStream stream(Bytes { bytes, sizeof(bytes) });
-        // FIXME: This should write the entire span.
-        MUST(stream.write_some(test_view.bytes()));
+        MUST(stream.write_until_depleted(test_view.bytes()));
         MUST(stream.seek(0));
 
         auto string = MUST(String::from_stream(stream, test_view.length()));
@@ -111,8 +110,7 @@ TEST_CASE(long_streams)
 
     {
         AllocatingMemoryStream stream;
-        // FIXME: This should write the entire span.
-        MUST(stream.write_some(("abc"sv).bytes()));
+        MUST(stream.write_until_depleted(("abc"sv).bytes()));
 
         auto string = MUST(String::from_stream(stream, 3u));
 
@@ -123,8 +121,7 @@ TEST_CASE(long_streams)
 
     {
         AllocatingMemoryStream stream;
-        // FIXME: This should write the entire span.
-        MUST(stream.write_some(("0123456789"sv).bytes()));
+        MUST(stream.write_until_depleted(("0123456789"sv).bytes()));
 
         auto string = MUST(String::from_stream(stream, 9u));
 
diff --git a/Tests/LibWasm/test-wasm.cpp b/Tests/LibWasm/test-wasm.cpp
index 1f8b0b4180..68067b9aed 100644
--- a/Tests/LibWasm/test-wasm.cpp
+++ b/Tests/LibWasm/test-wasm.cpp
@@ -32,8 +32,7 @@ TESTJS_GLOBAL_FUNCTION(read_binary_wasm_file, readBinaryWasmFile)
 
     auto array = TRY(JS::Uint8Array::create(realm, file_size.value()));
 
-    // FIXME: This should read the entire span.
-    auto read = file.value()->read_some(array->data());
+    auto read = file.value()->read_until_filled(array->data());
     if (read.is_error())
         return vm.throw_completion<JS::TypeError>(error_code_to_string(read.error().code()));
 
diff --git a/Tests/LibWeb/TestHTMLTokenizer.cpp b/Tests/LibWeb/TestHTMLTokenizer.cpp
index a6d03186a1..47965d2697 100644
--- a/Tests/LibWeb/TestHTMLTokenizer.cpp
+++ b/Tests/LibWeb/TestHTMLTokenizer.cpp
@@ -211,8 +211,7 @@ TEST_CASE(regression)
     auto file = MUST(Core::File::open(path, Core::File::OpenMode::Read));
     auto file_size = MUST(file->size());
     auto content = MUST(ByteBuffer::create_uninitialized(file_size));
-    // FIXME: This should read the entire span.
-    MUST(file->read_some(content.bytes()));
+    MUST(file->read_until_filled(content.bytes()));
     DeprecatedString file_contents { content.bytes() };
     auto tokens = run_tokenizer(file_contents);
     u32 hash = hash_tokens(tokens);
diff --git a/Userland/Applications/Browser/BrowserWindow.cpp b/Userland/Applications/Browser/BrowserWindow.cpp
index d88d593742..ab39e65f9e 100644
--- a/Userland/Applications/Browser/BrowserWindow.cpp
+++ b/Userland/Applications/Browser/BrowserWindow.cpp
@@ -775,8 +775,7 @@ ErrorOr<void> BrowserWindow::take_screenshot(ScreenshotType type)
     auto encoded = TRY(Gfx::PNGWriter::encode(*bitmap.bitmap()));
 
     auto screenshot_file = TRY(Core::File::open(path.string(), Core::File::OpenMode::Write));
-    // FIXME: This should write the entire span.
-    TRY(screenshot_file->write_some(encoded));
+    TRY(screenshot_file->write_until_depleted(encoded));
 
     return {};
 }
diff --git a/Userland/Applications/BrowserSettings/ContentFilterSettingsWidget.cpp b/Userland/Applications/BrowserSettings/ContentFilterSettingsWidget.cpp
index 551fa6b81d..435db8e5cf 100644
--- a/Userland/Applications/BrowserSettings/ContentFilterSettingsWidget.cpp
+++ b/Userland/Applications/BrowserSettings/ContentFilterSettingsWidget.cpp
@@ -50,8 +50,7 @@ ErrorOr<void> DomainListModel::save()
         TRY(builder.try_appendff("{}\n", domain));
 
     auto file = TRY(Core::File::open(filter_list_file_path(), Core::File::OpenMode::Write));
-    // FIXME: This should write the entire span.
-    TRY(file->write_some(TRY(builder.to_byte_buffer()).bytes()));
+    TRY(file->write_until_depleted(TRY(builder.to_byte_buffer()).bytes()));
     return {};
 }
 
diff --git a/Userland/Applications/CrashReporter/main.cpp b/Userland/Applications/CrashReporter/main.cpp
index bf3c17b0b1..b6d7a5beaa 100644
--- a/Userland/Applications/CrashReporter/main.cpp
+++ b/Userland/Applications/CrashReporter/main.cpp
@@ -284,8 +284,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         }
         auto byte_buffer = byte_buffer_or_error.release_value();
 
-        // FIXME: This should write the entire span.
-        if (auto result = file->write_some(byte_buffer); result.is_error())
+        if (auto result = file->write_until_depleted(byte_buffer); result.is_error())
             GUI::MessageBox::show(window, DeprecatedString::formatted("Couldn't save file: {}.", result.release_error()), "Saving backtrace failed"sv, GUI::MessageBox::Type::Error);
     };
     save_backtrace_button.set_enabled(false);
diff --git a/Userland/Applications/HexEditor/HexDocument.cpp b/Userland/Applications/HexEditor/HexDocument.cpp
index eddcc409f5..a350fd284a 100644
--- a/Userland/Applications/HexEditor/HexDocument.cpp
+++ b/Userland/Applications/HexEditor/HexDocument.cpp
@@ -62,12 +62,10 @@ void HexDocumentMemory::clear_changes()
 ErrorOr<void> HexDocumentMemory::write_to_file(Core::File& file)
 {
     TRY(file.seek(0, SeekMode::SetPosition));
-    // FIXME: This should write the entire span.
-    TRY(file.write_some(m_buffer));
+    TRY(file.write_until_depleted(m_buffer));
     for (auto& change : m_changes) {
         TRY(file.seek(change.key, SeekMode::SetPosition));
-        // FIXME: This should write the entire span.
-        TRY(file.write_some({ &change.value, 1 }));
+        TRY(file.write_until_depleted({ &change.value, 1 }));
     }
     return {};
 }
@@ -89,8 +87,7 @@ ErrorOr<void> HexDocumentFile::write_to_file()
 {
     for (auto& change : m_changes) {
         TRY(m_file->seek(change.key, SeekMode::SetPosition));
-        // FIXME: This should write the entire span.
-        TRY(m_file->write_some({ &change.value, 1 }));
+        TRY(m_file->write_until_depleted({ &change.value, 1 }));
     }
     clear_changes();
     // make sure the next get operation triggers a read
@@ -110,14 +107,12 @@ ErrorOr<void> HexDocumentFile::write_to_file(Core::File& file)
         auto copy_buffer = TRY(m_file->read_some(buffer));
         if (copy_buffer.size() == 0)
             break;
-       // FIXME: This should write the entire span.
-        TRY(file.write_some(copy_buffer));
+        TRY(file.write_until_depleted(copy_buffer));
     }
 
     for (auto& change : m_changes) {
         TRY(file.seek(change.key, SeekMode::SetPosition));
-        // FIXME: This should write the entire span.
-        TRY(file.write_some({ &change.value, 1 }));
+        TRY(file.write_until_depleted({ &change.value, 1 }));
     }
 
     return {};
diff --git a/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp b/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp
index 3695aadfc8..849494b414 100644
--- a/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp
+++ b/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp
@@ -191,8 +191,7 @@ ErrorOr<void> KeyboardMapperWidget::save_to_file(StringView filename)
     // Write to file.
     DeprecatedString file_content = map_json.to_deprecated_string();
     auto file = TRY(Core::File::open(filename, Core::File::OpenMode::Write));
-    // FIXME: This should write the entire span.
-    TRY(file->write_some(file_content.bytes()));
+    TRY(file->write_until_depleted(file_content.bytes()));
     file->close();
 
     window()->set_modified(false);
diff --git a/Userland/Applications/Magnifier/main.cpp b/Userland/Applications/Magnifier/main.cpp
index bd4664d13d..7f8273546f 100644
--- a/Userland/Applications/Magnifier/main.cpp
+++ b/Userland/Applications/Magnifier/main.cpp
@@ -73,8 +73,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
             filename = path.basename();
             auto encoded = TRY(dump_bitmap(magnifier->current_bitmap(), path.extension()));
 
-            // FIXME: This should write the entire span.
-            TRY(file->write_some(encoded));
+            TRY(file->write_until_depleted(encoded));
             return {};
         };
 
diff --git a/Userland/Applications/Run/RunWindow.cpp b/Userland/Applications/Run/RunWindow.cpp
index 252c2a6a1a..f97f90dae2 100644
--- a/Userland/Applications/Run/RunWindow.cpp
+++ b/Userland/Applications/Run/RunWindow.cpp
@@ -187,8 +187,7 @@ ErrorOr<void> RunWindow::save_history()
 
     // Write the first 25 items of history
     for (int i = 0; i < min(static_cast<int>(m_path_history.size()), 25); i++)
-        // FIXME: This should write the entire span.
-        TRY(file->write_some(DeprecatedString::formatted("{}\n", m_path_history[i]).bytes()));
+        TRY(file->write_until_depleted(DeprecatedString::formatted("{}\n", m_path_history[i]).bytes()));
 
     return {};
 }
diff --git a/Userland/Games/Chess/ChessWidget.cpp b/Userland/Games/Chess/ChessWidget.cpp
index 2c5ecc5409..753bb91f66 100644
--- a/Userland/Games/Chess/ChessWidget.cpp
+++ b/Userland/Games/Chess/ChessWidget.cpp
@@ -632,25 +632,24 @@ ErrorOr<void> ChessWidget::import_pgn(Core::File& file)
 ErrorOr<void> ChessWidget::export_pgn(Core::File& file) const
 {
     // Tag Pair Section
-    // FIXME: This should write the entire span.
-    TRY(file.write_some("[Event \"Casual Game\"]\n"sv.bytes()));
-    TRY(file.write_some("[Site \"SerenityOS Chess\"]\n"sv.bytes()));
-    TRY(file.write_some(DeprecatedString::formatted("[Date \"{}\"]\n", Core::DateTime::now().to_deprecated_string("%Y.%m.%d"sv)).bytes()));
-    TRY(file.write_some("[Round \"1\"]\n"sv.bytes()));
+    TRY(file.write_until_depleted("[Event \"Casual Game\"]\n"sv.bytes()));
+    TRY(file.write_until_depleted("[Site \"SerenityOS Chess\"]\n"sv.bytes()));
+    TRY(file.write_until_depleted(DeprecatedString::formatted("[Date \"{}\"]\n", Core::DateTime::now().to_deprecated_string("%Y.%m.%d"sv)).bytes()));
+    TRY(file.write_until_depleted("[Round \"1\"]\n"sv.bytes()));
 
     DeprecatedString username(getlogin());
     auto const player1 = (!username.is_empty() ? username.view() : "?"sv.bytes());
     auto const player2 = (!m_engine.is_null() ? "SerenityOS ChessEngine"sv.bytes() : "?"sv.bytes());
-    TRY(file.write_some(DeprecatedString::formatted("[White \"{}\"]\n", m_side == Chess::Color::White ? player1 : player2).bytes()));
-    TRY(file.write_some(DeprecatedString::formatted("[Black \"{}\"]\n", m_side == Chess::Color::Black ? player1 : player2).bytes()));
+    TRY(file.write_until_depleted(DeprecatedString::formatted("[White \"{}\"]\n", m_side == Chess::Color::White ? player1 : player2).bytes()));
+    TRY(file.write_until_depleted(DeprecatedString::formatted("[Black \"{}\"]\n", m_side == Chess::Color::Black ? player1 : player2).bytes()));
 
-    TRY(file.write_some(DeprecatedString::formatted("[Result \"{}\"]\n", Chess::Board::result_to_points_string(m_board.game_result(), m_board.turn())).bytes()));
-    TRY(file.write_some("[WhiteElo \"?\"]\n"sv.bytes()));
-    TRY(file.write_some("[BlackElo \"?\"]\n"sv.bytes()));
-    TRY(file.write_some("[Variant \"Standard\"]\n"sv.bytes()));
-    TRY(file.write_some("[TimeControl \"-\"]\n"sv.bytes()));
-    TRY(file.write_some("[Annotator \"SerenityOS Chess\"]\n"sv.bytes()));
-    TRY(file.write_some("\n"sv.bytes()));
+    TRY(file.write_until_depleted(DeprecatedString::formatted("[Result \"{}\"]\n", Chess::Board::result_to_points_string(m_board.game_result(), m_board.turn())).bytes()));
+    TRY(file.write_until_depleted("[WhiteElo \"?\"]\n"sv.bytes()));
+    TRY(file.write_until_depleted("[BlackElo \"?\"]\n"sv.bytes()));
+    TRY(file.write_until_depleted("[Variant \"Standard\"]\n"sv.bytes()));
+    TRY(file.write_until_depleted("[TimeControl \"-\"]\n"sv.bytes()));
+    TRY(file.write_until_depleted("[Annotator \"SerenityOS Chess\"]\n"sv.bytes()));
+    TRY(file.write_until_depleted("\n"sv.bytes()));
 
     // Movetext Section
     for (size_t i = 0, move_no = 1; i < m_board.moves().size(); i += 2, move_no++) {
@@ -658,17 +657,17 @@ ErrorOr<void> ChessWidget::export_pgn(Core::File& file) const
 
         if (i + 1 < m_board.moves().size()) {
             const DeprecatedString black = m_board.moves().at(i + 1).to_algebraic();
-            TRY(file.write_some(DeprecatedString::formatted("{}. {} {} ", move_no, white, black).bytes()));
+            TRY(file.write_until_depleted(DeprecatedString::formatted("{}. {} {} ", move_no, white, black).bytes()));
         } else {
-            TRY(file.write_some(DeprecatedString::formatted("{}. {} ", move_no, white).bytes()));
+            TRY(file.write_until_depleted(DeprecatedString::formatted("{}. {} ", move_no, white).bytes()));
         }
     }
 
-    TRY(file.write_some("{ "sv.bytes()));
-    TRY(file.write_some(Chess::Board::result_to_string(m_board.game_result(), m_board.turn()).bytes()));
-    TRY(file.write_some(" } "sv.bytes()));
-    TRY(file.write_some(Chess::Board::result_to_points_string(m_board.game_result(), m_board.turn()).bytes()));
-    TRY(file.write_some("\n"sv.bytes()));
+    TRY(file.write_until_depleted("{ "sv.bytes()));
+    TRY(file.write_until_depleted(Chess::Board::result_to_string(m_board.game_result(), m_board.turn()).bytes()));
+    TRY(file.write_until_depleted(" } "sv.bytes()));
+    TRY(file.write_until_depleted(Chess::Board::result_to_points_string(m_board.game_result(), m_board.turn()).bytes()));
+    TRY(file.write_until_depleted("\n"sv.bytes()));
 
     return {};
 }
diff --git a/Userland/Libraries/LibAudio/MP3Loader.cpp b/Userland/Libraries/LibAudio/MP3Loader.cpp
index 3a5274f649..ffdb8e5508 100644
--- a/Userland/Libraries/LibAudio/MP3Loader.cpp
+++ b/Userland/Libraries/LibAudio/MP3Loader.cpp
@@ -233,9 +233,7 @@ ErrorOr<MP3::MP3Frame, LoaderError> MP3LoaderPlugin::read_frame_data(MP3::Header
 
     size_t old_reservoir_size = m_bit_reservoir.used_buffer_size();
     LOADER_TRY(m_bitstream->read_until_filled(buffer));
-    // FIXME: This should write the entire span.
-    if (LOADER_TRY(m_bit_reservoir.write_some(buffer)) != header.slot_count)
-        return LoaderError { LoaderError::Category::IO, m_loaded_samples, "Could not write frame into bit reservoir." };
+    LOADER_TRY(m_bit_reservoir.write_until_depleted(buffer));
 
     // If we don't have enough data in the reservoir to process this frame, skip it (but keep the data).
     if (old_reservoir_size < static_cast<size_t>(frame.main_data_begin))
diff --git a/Userland/Libraries/LibCompress/Deflate.cpp b/Userland/Libraries/LibCompress/Deflate.cpp
index e7a8494305..8660163951 100644
--- a/Userland/Libraries/LibCompress/Deflate.cpp
+++ b/Userland/Libraries/LibCompress/Deflate.cpp
@@ -225,10 +225,8 @@ ErrorOr<Bytes> DeflateDecompressor::read_some(Bytes bytes)
             if (block_type == 0b00) {
                 m_input_stream->align_to_byte_boundary();
 
-                // FIXME: This should read the entire span.
-                LittleEndian<u16> length, negated_length;
-                TRY(m_input_stream->read_some(length.bytes()));
-                TRY(m_input_stream->read_some(negated_length.bytes()));
+                u16 length = TRY(m_input_stream->read_value<LittleEndian<u16>>());
+                u16 negated_length = TRY(m_input_stream->read_value<LittleEndian<u16>>());
 
                 if ((length ^ 0xffff) != negated_length)
                     return Error::from_string_literal("Calculated negated length does not equal stored negated length");
diff --git a/Userland/Libraries/LibCompress/Gzip.cpp b/Userland/Libraries/LibCompress/Gzip.cpp
index c5abab5657..fce7a5fc09 100644
--- a/Userland/Libraries/LibCompress/Gzip.cpp
+++ b/Userland/Libraries/LibCompress/Gzip.cpp
@@ -75,10 +75,8 @@ ErrorOr<Bytes> GzipDecompressor::read_some(Bytes bytes)
             current_member().m_nread += current_slice.size();
 
             if (current_slice.size() < slice.size()) {
-                // FIXME: This should read the entire span.
-                LittleEndian<u32> crc32, input_size;
-                TRY(m_input_stream->read_some(crc32.bytes()));
-                TRY(m_input_stream->read_some(input_size.bytes()));
+                u32 crc32 = TRY(m_input_stream->read_value<LittleEndian<u32>>());
+                u32 input_size = TRY(m_input_stream->read_value<LittleEndian<u32>>());
 
                 if (crc32 != current_member().m_checksum.digest())
                     return Error::from_string_literal("Stored CRC32 does not match the calculated CRC32 of the current member");
@@ -116,18 +114,16 @@ ErrorOr<Bytes> GzipDecompressor::read_some(Bytes bytes)
                 return Error::from_string_literal("Header is not supported by implementation");
 
             if (header.flags & Flags::FEXTRA) {
-                // FIXME: This should read the entire span.
-                LittleEndian<u16> subfield_id, length;
-                TRY(m_input_stream->read_some(subfield_id.bytes()));
-                TRY(m_input_stream->read_some(length.bytes()));
+                u16 subfield_id = TRY(m_input_stream->read_value<LittleEndian<u16>>());
+                u16 length = TRY(m_input_stream->read_value<LittleEndian<u16>>());
                 TRY(m_input_stream->discard(length));
+                (void)subfield_id;
             }
 
             auto discard_string = [&]() -> ErrorOr<void> {
                 char next_char;
                 do {
-                    // FIXME: This should read the entire span.
-                    TRY(m_input_stream->read_some({ &next_char, sizeof(next_char) }));
+                    next_char = TRY(m_input_stream->read_value<char>());
                 } while (next_char);
 
                 return {};
@@ -140,10 +136,9 @@ ErrorOr<Bytes> GzipDecompressor::read_some(Bytes bytes)
                 TRY(discard_string());
 
             if (header.flags & Flags::FHCRC) {
-                // FIXME: This should read the entire span.
-                LittleEndian<u16> crc16;
-                TRY(m_input_stream->read_some(crc16.bytes()));
+                u16 crc = TRY(m_input_stream->read_value<LittleEndian<u16>>());
                 // FIXME: we should probably verify this instead of just assuming it matches
+                (void)crc;
             }
 
             m_current_member = TRY(Member::construct(header, *m_input_stream));
diff --git a/Userland/Libraries/LibCompress/Zlib.cpp b/Userland/Libraries/LibCompress/Zlib.cpp
index ccf30ec89a..91f8413460 100644
--- a/Userland/Libraries/LibCompress/Zlib.cpp
+++ b/Userland/Libraries/LibCompress/Zlib.cpp
@@ -113,8 +113,7 @@ ErrorOr<void> ZlibCompressor::write_header(ZlibCompressionMethod compression_met
 
     // FIXME: Support pre-defined dictionaries.
 
-    // FIXME: This should write the entire span.
-    TRY(m_output_stream->write_some(header.as_u16.bytes()));
+    TRY(m_output_stream->write_until_depleted(header.as_u16.bytes()));
 
     return {};
 }
@@ -155,8 +154,7 @@ ErrorOr<void> ZlibCompressor::finish()
         TRY(static_cast<DeflateCompressor*>(m_compressor.ptr())->final_flush());
 
     NetworkOrdered<u32> adler_sum = m_adler32_checksum.digest();
-    // FIXME: This should write the entire span.
-    TRY(m_output_stream->write_some(adler_sum.bytes()));
+    TRY(m_output_stream->write_value(adler_sum));
 
     m_finished = true;
 
diff --git a/Userland/Libraries/LibCore/ConfigFile.cpp b/Userland/Libraries/LibCore/ConfigFile.cpp
index faa333a225..a302fd9b46 100644
--- a/Userland/Libraries/LibCore/ConfigFile.cpp
+++ b/Userland/Libraries/LibCore/ConfigFile.cpp
@@ -179,11 +179,10 @@ ErrorOr<void> ConfigFile::sync()
     TRY(m_file->seek(0, SeekMode::SetPosition));
 
     for (auto& it : m_groups) {
-        // FIXME: This should write the entire span.
-        TRY(m_file->write_some(DeprecatedString::formatted("[{}]\n", it.key).bytes()));
+        TRY(m_file->write_until_depleted(DeprecatedString::formatted("[{}]\n", it.key).bytes()));
         for (auto& jt : it.value)
-            TRY(m_file->write_some(DeprecatedString::formatted("{}={}\n", jt.key, jt.value).bytes()));
-        TRY(m_file->write_some("\n"sv.bytes()));
+            TRY(m_file->write_until_depleted(DeprecatedString::formatted("{}={}\n", jt.key, jt.value).bytes()));
+        TRY(m_file->write_until_depleted("\n"sv.bytes()));
     }
 
     m_dirty = false;
diff --git a/Userland/Libraries/LibCore/EventLoop.cpp b/Userland/Libraries/LibCore/EventLoop.cpp
index b5a0c98521..149360e181 100644
--- a/Userland/Libraries/LibCore/EventLoop.cpp
+++ b/Userland/Libraries/LibCore/EventLoop.cpp
@@ -221,9 +221,7 @@ public:
         auto bytes_to_send = serialized.bytes();
         u32 length = bytes_to_send.size();
         // FIXME: Propagate errors
-        // FIXME: This should write the entire span.
-        auto sent = MUST(m_socket->write_some({ (u8 const*)&length, sizeof(length) }));
-        VERIFY(sent == sizeof(length));
+        MUST(m_socket->write_value(length));
         while (!bytes_to_send.is_empty()) {
             size_t bytes_sent = MUST(m_socket->write_some(bytes_to_send));
             bytes_to_send = bytes_to_send.slice(bytes_sent);
diff --git a/Userland/Libraries/LibGUI/TextEditor.cpp b/Userland/Libraries/LibGUI/TextEditor.cpp
index 74482ed7bb..8a9cf9ee86 100644
--- a/Userland/Libraries/LibGUI/TextEditor.cpp
+++ b/Userland/Libraries/LibGUI/TextEditor.cpp
@@ -1593,9 +1593,8 @@ ErrorOr<void> TextEditor::write_to_file(Core::File& file)
         // A size 0 file doesn't need a data copy.
     } else {
         for (size_t i = 0; i < line_count(); ++i) {
-            // FIXME: This should write the entire span.
-            TRY(file.write_some(line(i).to_utf8().bytes()));
-            TRY(file.write_some("\n"sv.bytes()));
+            TRY(file.write_until_depleted(line(i).to_utf8().bytes()));
+            TRY(file.write_until_depleted("\n"sv.bytes()));
         }
     }
     document().set_unmodified();
diff --git a/Userland/Libraries/LibIMAP/Client.cpp b/Userland/Libraries/LibIMAP/Client.cpp
index e952e73ca9..753af26ad9 100644
--- a/Userland/Libraries/LibIMAP/Client.cpp
+++ b/Userland/Libraries/LibIMAP/Client.cpp
@@ -60,8 +60,7 @@ ErrorOr<void> Client::on_ready_to_receive()
 
     auto pending_bytes = TRY(m_socket->pending_bytes());
     auto receive_buffer = TRY(m_buffer.get_bytes_for_writing(pending_bytes));
-    // FIXME: This should read the entire span.
-    TRY(m_socket->read_some(receive_buffer));
+    TRY(m_socket->read_until_filled(receive_buffer));
 
     // Once we get server hello we can start sending.
     if (m_connect_pending) {
@@ -146,9 +145,8 @@ static ReadonlyBytes command_byte_buffer(CommandType command)
 
 ErrorOr<void> Client::send_raw(StringView data)
 {
-    // FIXME: This should write the entire span.
-    TRY(m_socket->write_some(data.bytes()));
-    TRY(m_socket->write_some("\r\n"sv.bytes()));
+    TRY(m_socket->write_until_depleted(data.bytes()));
+    TRY(m_socket->write_until_depleted("\r\n"sv.bytes()));
 
     return {};
 }
diff --git a/Userland/Libraries/LibJS/Console.cpp b/Userland/Libraries/LibJS/Console.cpp
index cc3af07d97..c977452cc2 100644
--- a/Userland/Libraries/LibJS/Console.cpp
+++ b/Userland/Libraries/LibJS/Console.cpp
@@ -680,8 +680,7 @@ ThrowCompletionOr<String> ConsoleClient::generically_format_values(MarkedVector<
     bool first = true;
     for (auto const& value : values) {
         if (!first)
-            // FIXME: This should write the entire span.
-            TRY_OR_THROW_OOM(vm, stream.write_some(" "sv.bytes()));
+            TRY_OR_THROW_OOM(vm, stream.write_until_depleted(" "sv.bytes()));
         TRY_OR_THROW_OOM(vm, JS::print(value, ctx));
         first = false;
     }
diff --git a/Userland/Libraries/LibLine/XtermSuggestionDisplay.cpp b/Userland/Libraries/LibLine/XtermSuggestionDisplay.cpp
index 98833292f0..fbb8a552ff 100644
--- a/Userland/Libraries/LibLine/XtermSuggestionDisplay.cpp
+++ b/Userland/Libraries/LibLine/XtermSuggestionDisplay.cpp
@@ -51,8 +51,7 @@ ErrorOr<void> XtermSuggestionDisplay::display(SuggestionManager const& manager)
         // the suggestion list to fit in the prompt line.
         auto start = max_line_count - m_prompt_lines_at_suggestion_initiation;
         for (size_t i = start; i < max_line_count; ++i)
-            // FIXME: This should write the entire span.
-            TRY(stderr_stream->write_some("\n"sv.bytes()));
+            TRY(stderr_stream->write_until_depleted("\n"sv.bytes()));
         lines_used += max_line_count;
         longest_suggestion_length = 0;
     }
@@ -100,8 +99,7 @@ ErrorOr<void> XtermSuggestionDisplay::display(SuggestionManager const& manager)
         if (next_column > m_num_columns) {
             auto lines = (suggestion.text_view.length() + m_num_columns - 1) / m_num_columns;
             lines_used += lines;
-            // FIXME: This should write the entire span.
-            TRY(stderr_stream->write_some("\n"sv.bytes()));
+            TRY(stderr_stream->write_until_depleted("\n"sv.bytes()));
             num_printed = 0;
         }
 
@@ -117,13 +115,11 @@ ErrorOr<void> XtermSuggestionDisplay::display(SuggestionManager const& manager)
 
         if (spans_entire_line) {
             num_printed += m_num_columns;
-            // FIXME: This should write the entire span.
-            TRY(stderr_stream->write_some(suggestion.text_string.bytes()));
-            TRY(stderr_stream->write_some(suggestion.display_trivia_string.bytes()));
+            TRY(stderr_stream->write_until_depleted(suggestion.text_string.bytes()));
+            TRY(stderr_stream->write_until_depleted(suggestion.display_trivia_string.bytes()));
         } else {
             auto field = DeprecatedString::formatted("{: <{}}  {}", suggestion.text_string, longest_suggestion_byte_length_without_trivia, suggestion.display_trivia_string);
-            // FIXME: This should write the entire span.
-            TRY(stderr_stream->write_some(DeprecatedString::formatted("{: <{}}", field, longest_suggestion_byte_length + 2).bytes()));
+            TRY(stderr_stream->write_until_depleted(DeprecatedString::formatted("{: <{}}", field, longest_suggestion_byte_length + 2).bytes()));
             num_printed += longest_suggestion_length + 2;
         }
 
@@ -154,8 +150,7 @@ ErrorOr<void> XtermSuggestionDisplay::display(SuggestionManager const& manager)
 
         TRY(VT::move_absolute(m_origin_row + lines_used, m_num_columns - string.length() - 1, *stderr_stream));
         TRY(VT::apply_style({ Style::Background(Style::XtermColor::Green) }, *stderr_stream));
-        // FIXME: This should write the entire span.
-        TRY(stderr_stream->write_some(string.bytes()));
+        TRY(stderr_stream->write_until_depleted(string.bytes()));
         TRY(VT::apply_style(Style::reset_style(), *stderr_stream));
     }
 
diff --git a/Userland/Libraries/LibSQL/SQLClient.cpp b/Userland/Libraries/LibSQL/SQLClient.cpp
index 44e11cdd90..db9455b83e 100644
--- a/Userland/Libraries/LibSQL/SQLClient.cpp
+++ b/Userland/Libraries/LibSQL/SQLClient.cpp
@@ -67,8 +67,7 @@ static ErrorOr<void> launch_server(DeprecatedString const& socket_path, Deprecat
 
         if (server_pid != 0) {
             auto server_pid_file = TRY(Core::File::open(pid_path, Core::File::OpenMode::Write));
-            // FIXME: This should write the entire span.
-            TRY(server_pid_file->write_some(DeprecatedString::number(server_pid).bytes()));
+            TRY(server_pid_file->write_until_depleted(DeprecatedString::number(server_pid).bytes()));
 
             TRY(Core::System::kill(getpid(), SIGTERM));
         }
diff --git a/Userland/Libraries/LibTest/JavaScriptTestRunner.h b/Userland/Libraries/LibTest/JavaScriptTestRunner.h
index fd944a90c9..738172ef54 100644
--- a/Userland/Libraries/LibTest/JavaScriptTestRunner.h
+++ b/Userland/Libraries/LibTest/JavaScriptTestRunner.h
@@ -220,8 +220,7 @@ inline ByteBuffer load_entire_file(StringView path)
         auto file = TRY(Core::File::open(path, Core::File::OpenMode::Read));
         auto file_size = TRY(file->size());
         auto content = TRY(ByteBuffer::create_uninitialized(file_size));
-        // FIXME: This should read the entire span.
-        TRY(file->read_some(content.bytes()));
+        TRY(file->read_until_filled(content.bytes()));
         return content;
     };
 
diff --git a/Userland/Libraries/LibWeb/WebDriver/Client.cpp b/Userland/Libraries/LibWeb/WebDriver/Client.cpp
index 99b645bb65..6161e8b61f 100644
--- a/Userland/Libraries/LibWeb/WebDriver/Client.cpp
+++ b/Userland/Libraries/LibWeb/WebDriver/Client.cpp
@@ -279,8 +279,7 @@ ErrorOr<void, Client::WrappedError> Client::send_success_response(JsonValue resu
     builder.append("\r\n"sv);
 
     auto builder_contents = TRY(builder.to_byte_buffer());
-    // FIXME: This should write the entire span.
-    TRY(m_socket->write_some(builder_contents));
+    TRY(m_socket->write_until_depleted(builder_contents));
 
     while (!content.is_empty()) {
         auto bytes_sent = TRY(m_socket->write_some(content.bytes()));
@@ -320,9 +319,8 @@ ErrorOr<void, Client::WrappedError> Client::send_error_response(Error const& err
     header_builder.appendff("Content-Length: {}\r\n", content_builder.length());
     header_builder.append("\r\n"sv);
 
-    // FIXME: This should write the entire span.
-    TRY(m_socket->write_some(TRY(header_builder.to_byte_buffer())));
-    TRY(m_socket->write_some(TRY(content_builder.to_byte_buffer())));
+    TRY(m_socket->write_until_depleted(TRY(header_builder.to_byte_buffer())));
+    TRY(m_socket->write_until_depleted(TRY(content_builder.to_byte_buffer())));
 
     log_response(error.http_status);
     return {};
diff --git a/Userland/Services/EchoServer/Client.cpp b/Userland/Services/EchoServer/Client.cpp
index ba382cedbd..4b028e2e6e 100644
--- a/Userland/Services/EchoServer/Client.cpp
+++ b/Userland/Services/EchoServer/Client.cpp
@@ -40,8 +40,7 @@ ErrorOr<void> Client::drain_socket()
             break;
         }
 
-        // FIXME: This should write the entire span.
-        TRY(m_socket->write_some(bytes_read));
+        TRY(m_socket->write_until_depleted(bytes_read));
     }
 
     return {};
diff --git a/Userland/Services/FileOperation/main.cpp b/Userland/Services/FileOperation/main.cpp
index 69dbbfa3c7..a8d5f61d2d 100644
--- a/Userland/Services/FileOperation/main.cpp
+++ b/Userland/Services/FileOperation/main.cpp
@@ -240,8 +240,7 @@ ErrorOr<int> execute_work_items(Vector<WorkItem> const& items)
                 auto bytes_read = TRY(source_file->read_some(buffer.bytes()));
                 if (bytes_read.is_empty())
                     break;
-                // FIXME: This should write the entire span.
-                if (auto result = destination_file->write_some(bytes_read); result.is_error()) {
+                if (auto result = destination_file->write_until_depleted(bytes_read); result.is_error()) {
                     // FIXME: Return the formatted string directly. There is no way to do this right now without the temporary going out of scope and being destroyed.
                     report_warning(DeprecatedString::formatted("Failed to write to destination file: {}", result.error()));
                     return result.release_error();
diff --git a/Userland/Services/InspectorServer/InspectableProcess.cpp b/Userland/Services/InspectorServer/InspectableProcess.cpp
index dececc1e0c..89e8b66755 100644
--- a/Userland/Services/InspectorServer/InspectableProcess.cpp
+++ b/Userland/Services/InspectorServer/InspectableProcess.cpp
@@ -26,9 +26,8 @@ InspectableProcess::InspectableProcess(pid_t pid, NonnullOwnPtr<Core::LocalSocke
     MUST(m_socket->set_blocking(true));
 
     m_socket->on_ready_to_read = [this] {
-        char c;
-        // FIXME: This should read the entire span.
-        [[maybe_unused]] auto buffer = m_socket->read_some({ &c, 1 });
+        [[maybe_unused]] auto c = m_socket->read_value<char>().release_value_but_fixme_should_propagate_errors();
+
         if (m_socket->is_eof()) {
             Core::deferred_invoke([pid = this->m_pid] { g_processes.remove(pid); });
             return;
@@ -44,14 +43,7 @@ DeprecatedString InspectableProcess::wait_for_response()
         return {};
     }
 
-    u32 length {};
-    // FIXME: This should read the entire span.
-    auto length_bytes_read = m_socket->read_some({ (u8*)&length, sizeof(length) }).release_value_but_fixme_should_propagate_errors();
-    if (length_bytes_read.size() != sizeof(length)) {
-        dbgln("InspectableProcess got malformed data: PID {}", m_pid);
-        m_socket->close();
-        return {};
-    }
+    auto length = m_socket->read_value<u32>().release_value_but_fixme_should_propagate_errors();
 
     auto data_buffer = ByteBuffer::create_uninitialized(length).release_value_but_fixme_should_propagate_errors();
     auto remaining_data_buffer = data_buffer.bytes();
@@ -82,9 +74,8 @@ void InspectableProcess::send_request(JsonObject const& request)
     u32 length = serialized.length();
 
     // FIXME: Propagate errors
-    // FIXME: This should write the entire span.
-    MUST(m_socket->write_some({ (u8 const*)&length, sizeof(length) }));
-    MUST(m_socket->write_some(serialized.bytes()));
+    MUST(m_socket->write_value(length));
+    MUST(m_socket->write_until_depleted(serialized.bytes()));
 }
 
 }
diff --git a/Userland/Services/LookupServer/LookupServer.cpp b/Userland/Services/LookupServer/LookupServer.cpp
index c93f6b4992..17dfc2ed45 100644
--- a/Userland/Services/LookupServer/LookupServer.cpp
+++ b/Userland/Services/LookupServer/LookupServer.cpp
@@ -239,8 +239,7 @@ ErrorOr<Vector<Answer>> LookupServer::lookup(Name const& name, DeprecatedString
     auto udp_socket = TRY(Core::UDPSocket::connect(nameserver, 53, Time::from_seconds(1)));
     TRY(udp_socket->set_blocking(true));
 
-    // FIXME: This should write the entire span.
-    TRY(udp_socket->write_some(buffer));
+    TRY(udp_socket->write_until_depleted(buffer));
 
     u8 response_buffer[4096];
     int nrecv = TRY(udp_socket->read_some({ response_buffer, sizeof(response_buffer) })).size();
diff --git a/Userland/Services/TelnetServer/Client.cpp b/Userland/Services/TelnetServer/Client.cpp
index 4f0db9fc1a..f4d5d0e28b 100644
--- a/Userland/Services/TelnetServer/Client.cpp
+++ b/Userland/Services/TelnetServer/Client.cpp
@@ -161,8 +161,7 @@ ErrorOr<void> Client::send_data(StringView data)
     }
 
     if (fast) {
-        // FIXME: This should write the entire span.
-        TRY(m_socket->write_some({ data.characters_without_null_termination(), data.length() }));
+        TRY(m_socket->write_until_depleted({ data.characters_without_null_termination(), data.length() }));
         return {};
     }
 
@@ -184,8 +183,7 @@ ErrorOr<void> Client::send_data(StringView data)
     }
 
     auto builder_contents = TRY(builder.to_byte_buffer());
-    // FIXME: This should write the entire span.
-    TRY(m_socket->write_some(builder_contents));
+    TRY(m_socket->write_until_depleted(builder_contents));
     return {};
 }
 
@@ -206,8 +204,7 @@ ErrorOr<void> Client::send_commands(Vector<Command> commands)
     }
 
     VERIFY(TRY(stream.tell()) == buffer.size());
-    // FIXME: This should write the entire span.
-    TRY(m_socket->write_some({ buffer.data(), buffer.size() }));
+    TRY(m_socket->write_until_depleted({ buffer.data(), buffer.size() }));
     return {};
 }
 
diff --git a/Userland/Services/WebServer/Client.cpp b/Userland/Services/WebServer/Client.cpp
index 571b09da0b..43b40da3e0 100644
--- a/Userland/Services/WebServer/Client.cpp
+++ b/Userland/Services/WebServer/Client.cpp
@@ -192,8 +192,7 @@ ErrorOr<void> Client::send_response(Stream& response, HTTP::HttpRequest const& r
     builder.append("\r\n"sv);
 
     auto builder_contents = TRY(builder.to_byte_buffer());
-    // FIXME: This should write the entire span.
-    TRY(m_socket->write_some(builder_contents));
+    TRY(m_socket->write_until_depleted(builder_contents));
     log_response(200, request);
 
     char buffer[PAGE_SIZE];
@@ -235,8 +234,7 @@ ErrorOr<void> Client::send_redirect(StringView redirect_path, HTTP::HttpRequest
     builder.append("\r\n"sv);
 
     auto builder_contents = TRY(builder.to_byte_buffer());
-    // FIXME: This should write the entire span.
-    TRY(m_socket->write_some(builder_contents));
+    TRY(m_socket->write_until_depleted(builder_contents));
 
     log_response(301, request);
     return {};
@@ -365,9 +363,8 @@ ErrorOr<void> Client::send_error_response(unsigned code, HTTP::HttpRequest const
     header_builder.append("Content-Type: text/html; charset=UTF-8\r\n"sv);
     header_builder.appendff("Content-Length: {}\r\n", content_builder.length());
     header_builder.append("\r\n"sv);
-    // FIXME: This should write the entire span.
-    TRY(m_socket->write_some(TRY(header_builder.to_byte_buffer())));
-    TRY(m_socket->write_some(TRY(content_builder.to_byte_buffer())));
+    TRY(m_socket->write_until_depleted(TRY(header_builder.to_byte_buffer())));
+    TRY(m_socket->write_until_depleted(TRY(content_builder.to_byte_buffer())));
 
     log_response(code, request);
     return {};
diff --git a/Userland/Utilities/gml-format.cpp b/Userland/Utilities/gml-format.cpp
index 465573d722..49ef4a4898 100644
--- a/Userland/Utilities/gml-format.cpp
+++ b/Userland/Utilities/gml-format.cpp
@@ -28,8 +28,7 @@ static ErrorOr<bool> format_file(StringView path, bool inplace)
             return true;
         TRY(file->seek(0, SeekMode::SetPosition));
         TRY(file->truncate(0));
-        // FIXME: This should write the entire span.
-        TRY(file->write_some(formatted_gml.bytes()));
+        TRY(file->write_until_depleted(formatted_gml.bytes()));
     } else {
         out("{}", formatted_gml);
     }
diff --git a/Userland/Utilities/headless-browser.cpp b/Userland/Utilities/headless-browser.cpp
index 7453120887..0eb070c1fb 100644
--- a/Userland/Utilities/headless-browser.cpp
+++ b/Userland/Utilities/headless-browser.cpp
@@ -174,8 +174,7 @@ static ErrorOr<NonnullRefPtr<Core::Timer>> load_page_for_screenshot_and_exit(Cor
 
                 auto output_file = MUST(Core::File::open(output_file_path, Core::File::OpenMode::Write));
                 auto image_buffer = MUST(Gfx::PNGWriter::encode(*screenshot));
-                // FIXME: This should write the entire buffer.
-                MUST(output_file->write_some(image_buffer.bytes()));
+                MUST(output_file->write_until_depleted(image_buffer.bytes()));
             } else {
                 warnln("No screenshot available");
             }
diff --git a/Userland/Utilities/js.cpp b/Userland/Utilities/js.cpp
index db9fae8d59..48a446965b 100644
--- a/Userland/Utilities/js.cpp
+++ b/Userland/Utilities/js.cpp
@@ -188,8 +188,7 @@ static ErrorOr<void> write_to_file(String const& path)
     for (size_t i = 0; i < g_repl_statements.size(); i++) {
         auto line = g_repl_statements[i].bytes();
         if (line.size() > 0 && i != g_repl_statements.size() - 1) {
-            // FIXME: This should write the entire span.
-            TRY(file->write_some(line));
+            TRY(file->write_until_depleted(line));
         }
         if (i != g_repl_statements.size() - 1) {
             TRY(file->write_value('\n'));
diff --git a/Userland/Utilities/nc.cpp b/Userland/Utilities/nc.cpp
index 858bbed77d..7ea01aeccd 100644
--- a/Userland/Utilities/nc.cpp
+++ b/Userland/Utilities/nc.cpp
@@ -82,8 +82,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
             auto nread = TRY(Core::System::read(STDIN_FILENO, buffer_span));
             buffer_span = buffer_span.trim(nread);
 
-            // FIXME: This should write the entire span.
-            TRY(socket->write_some({ buffer_span.data(), static_cast<size_t>(nread) }));
+            TRY(socket->write_until_depleted({ buffer_span.data(), static_cast<size_t>(nread) }));
         }
     }
 
diff --git a/Userland/Utilities/reboot.cpp b/Userland/Utilities/reboot.cpp
index 462e2e0111..3210d556b5 100644
--- a/Userland/Utilities/reboot.cpp
+++ b/Userland/Utilities/reboot.cpp
@@ -14,8 +14,7 @@ ErrorOr<int> serenity_main(Main::Arguments)
     auto file = TRY(Core::File::open("/sys/kernel/power_state"sv, Core::File::OpenMode::Write));
 
     const DeprecatedString file_contents = "1";
-    // FIXME: This should write the entire span.
-    TRY(file->write_some(file_contents.bytes()));
+    TRY(file->write_until_depleted(file_contents.bytes()));
     file->close();
 
     return 0;
diff --git a/Userland/Utilities/sed.cpp b/Userland/Utilities/sed.cpp
index a978896bc7..8ecf6540aa 100644
--- a/Userland/Utilities/sed.cpp
+++ b/Userland/Utilities/sed.cpp
@@ -141,9 +141,8 @@ ErrorOr<int> serenity_main(Main::Arguments args)
 
             if (maybe_output_file.has_value()) {
                 auto const& output_file = maybe_output_file.value();
-                // FIXME: This should write the entire span.
-                TRY(output_file->write_some(result.bytes()));
-                TRY(output_file->write_some("\n"sv.bytes()));
+                TRY(output_file->write_until_depleted(result.bytes()));
+                TRY(output_file->write_until_depleted("\n"sv.bytes()));
             }
         }
     }
diff --git a/Userland/Utilities/shot.cpp b/Userland/Utilities/shot.cpp
index 78e3c4db83..c168f9d583 100644
--- a/Userland/Utilities/shot.cpp
+++ b/Userland/Utilities/shot.cpp
@@ -167,8 +167,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     }
 
     auto& file = *file_or_error.value();
-    // FIXME: This should write the entire span.
-    TRY(file.write_some(encoded_bitmap.bytes()));
+    TRY(file.write_until_depleted(encoded_bitmap.bytes()));
 
     if (edit_image)
         TRY(Core::Process::spawn("/bin/PixelPaint"sv, Array { output_path }));
diff --git a/Userland/Utilities/shutdown.cpp b/Userland/Utilities/shutdown.cpp
index 2547de06a5..c4cbfdfbcf 100644
--- a/Userland/Utilities/shutdown.cpp
+++ b/Userland/Utilities/shutdown.cpp
@@ -18,8 +18,7 @@ ErrorOr<int> serenity_main(Main::Arguments)
     auto file = TRY(Core::File::open("/sys/kernel/power_state"sv, Core::File::OpenMode::Write));
 
     const DeprecatedString file_contents = "2";
-    // FIXME: This should write the entire span.
-    TRY(file->write_some(file_contents.bytes()));
+    TRY(file->write_until_depleted(file_contents.bytes()));
     file->close();
 
     return 0;
diff --git a/Userland/Utilities/strace.cpp b/Userland/Utilities/strace.cpp
index e1afa0e22b..b026cac11b 100644
--- a/Userland/Utilities/strace.cpp
+++ b/Userland/Utilities/strace.cpp
@@ -932,7 +932,6 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         FormattedSyscallBuilder builder(syscall_name);
         TRY(format_syscall(builder, syscall_function, arg1, arg2, arg3, res));
 
-        // FIXME: This should write the entire span.
-        TRY(trace_file->write_some(builder.string_view().bytes()));
+        TRY(trace_file->write_until_depleted(builder.string_view().bytes()));
     }
 }
diff --git a/Userland/Utilities/sysctl.cpp b/Userland/Utilities/sysctl.cpp
index 90d587ed6c..33883dc187 100644
--- a/Userland/Utilities/sysctl.cpp
+++ b/Userland/Utilities/sysctl.cpp
@@ -48,8 +48,7 @@ static bool write_variable(StringView name, StringView value)
         warnln("Failed to open {}: {}", path, file.error());
         return false;
     }
-    // FIXME: This should write the entire span.
-    if (auto result = file.value()->write_some(value.bytes()); result.is_error()) {
+    if (auto result = file.value()->write_until_depleted(value.bytes()); result.is_error()) {
         warnln("Failed to write {}: {}", path, result.error());
         return false;
     }
diff --git a/Userland/Utilities/tail.cpp b/Userland/Utilities/tail.cpp
index 3e73b69cd4..6f89a84ed3 100644
--- a/Userland/Utilities/tail.cpp
+++ b/Userland/Utilities/tail.cpp
@@ -34,10 +34,8 @@ static ErrorOr<off_t> find_seek_pos(Core::File& file, int wanted_lines)
 
         if (file.is_eof())
             break;
-        Array<u8, 1> buffer;
-        // FIXME: This should read the entire span.
-        auto ch = TRY(file.read_some(buffer));
-        if (*ch.data() == '\n' && (end - pos) > 1) {
+        auto ch = TRY(file.read_value<u8>());
+        if (ch == '\n' && (end - pos) > 1) {
             lines++;
             if (lines == wanted_lines)
                 break;
diff --git a/Userland/Utilities/uniq.cpp b/Userland/Utilities/uniq.cpp
index 7253c5924d..f7609da2ca 100644
--- a/Userland/Utilities/uniq.cpp
+++ b/Userland/Utilities/uniq.cpp
@@ -17,11 +17,10 @@ static ErrorOr<void> write_line_content(StringView line, size_t count, bool dupl
     if (duplicates_only && count <= 1)
         return {};
 
-    // FIXME: This should write the entire span.
     if (print_count)
-        TRY(outfile.write_some(DeprecatedString::formatted("{} {}\n", count, line).bytes()));
+        TRY(outfile.write_until_depleted(DeprecatedString::formatted("{} {}\n", count, line).bytes()));
     else
-        TRY(outfile.write_some(DeprecatedString::formatted("{}\n", line).bytes()));
+        TRY(outfile.write_until_depleted(DeprecatedString::formatted("{}\n", line).bytes()));
     return {};
 }
 
diff --git a/Userland/Utilities/utmpupdate.cpp b/Userland/Utilities/utmpupdate.cpp
index be2ec0334d..77d98b1f16 100644
--- a/Userland/Utilities/utmpupdate.cpp
+++ b/Userland/Utilities/utmpupdate.cpp
@@ -72,8 +72,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     TRY(file->seek(0, SeekMode::SetPosition));
     TRY(file->truncate(0));
-    // FIXME: This should write the entire span.
-    TRY(file->write_some(json.to_deprecated_string().bytes()));
+    TRY(file->write_until_depleted(json.to_deprecated_string().bytes()));
 
     return 0;
 }
diff --git a/Userland/Utilities/wasm.cpp b/Userland/Utilities/wasm.cpp
index 1fb1f33066..2443fe4e07 100644
--- a/Userland/Utilities/wasm.cpp
+++ b/Userland/Utilities/wasm.cpp
@@ -53,14 +53,12 @@ static bool pre_interpret_hook(Wasm::Configuration& config, Wasm::InstructionPoi
     if (always_print_stack)
         config.dump_stack();
     if (always_print_instruction) {
-        // FIXME: This should write the entire span.
-        g_stdout->write_some(DeprecatedString::formatted("{:0>4} ", ip.value()).bytes()).release_value_but_fixme_should_propagate_errors();
+        g_stdout->write_until_depleted(DeprecatedString::formatted("{:0>4} ", ip.value()).bytes()).release_value_but_fixme_should_propagate_errors();
         g_printer->print(instr);
     }
     if (g_continue)
         return true;
-    // FIXME: This should write the entire span.
-    g_stdout->write_some(DeprecatedString::formatted("{:0>4} ", ip.value()).bytes()).release_value_but_fixme_should_propagate_errors();
+    g_stdout->write_until_depleted(DeprecatedString::formatted("{:0>4} ", ip.value()).bytes()).release_value_but_fixme_should_propagate_errors();
     g_printer->print(instr);
     DeprecatedString last_command = "";
     for (;;) {
@@ -216,8 +214,7 @@ static bool pre_interpret_hook(Wasm::Configuration& config, Wasm::InstructionPoi
                 if (!result.values().is_empty())
                     warnln("Returned:");
                 for (auto& value : result.values()) {
-                    // FIXME: This should write the entire span.
-                    g_stdout->write_some("  -> "sv.bytes()).release_value_but_fixme_should_propagate_errors();
+                    g_stdout->write_until_depleted("  -> "sv.bytes()).release_value_but_fixme_should_propagate_errors();
                     g_printer->print(value);
                 }
             }
@@ -457,18 +454,15 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
         auto print_func = [&](auto const& address) {
             Wasm::FunctionInstance* fn = machine.store().get(address);
-            // FIXME: This should write the entire span.
-            g_stdout->write_some(DeprecatedString::formatted("- Function with address {}, ptr = {}\n", address.value(), fn).bytes()).release_value_but_fixme_should_propagate_errors();
+            g_stdout->write_until_depleted(DeprecatedString::formatted("- Function with address {}, ptr = {}\n", address.value(), fn).bytes()).release_value_but_fixme_should_propagate_errors();
             if (fn) {
-                // FIXME: This should write the entire span.
-                g_stdout->write_some(DeprecatedString::formatted("    wasm function? {}\n", fn->has<Wasm::WasmFunction>()).bytes()).release_value_but_fixme_should_propagate_errors();
+                g_stdout->write_until_depleted(DeprecatedString::formatted("    wasm function? {}\n", fn->has<Wasm::WasmFunction>()).bytes()).release_value_but_fixme_should_propagate_errors();
                 fn->visit(
                     [&](Wasm::WasmFunction const& func) {
                         Wasm::Printer printer { *g_stdout, 3 };
-                        // FIXME: This should write the entire span.
-                        g_stdout->write_some("    type:\n"sv.bytes()).release_value_but_fixme_should_propagate_errors();
+                        g_stdout->write_until_depleted("    type:\n"sv.bytes()).release_value_but_fixme_should_propagate_errors();
                         printer.print(func.type());
-                        g_stdout->write_some("    code:\n"sv.bytes()).release_value_but_fixme_should_propagate_errors();
+                        g_stdout->write_until_depleted("    code:\n"sv.bytes()).release_value_but_fixme_should_propagate_errors();
                         printer.print(func.code());
                     },
                     [](Wasm::HostFunction const&) {});
@@ -532,8 +526,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
                 if (!result.values().is_empty())
                     warnln("Returned:");
                 for (auto& value : result.values()) {
-                    // FIXME: This should write the entire span.
-                    g_stdout->write_some("  -> "sv.bytes()).release_value_but_fixme_should_propagate_errors();
+                    g_stdout->write_until_depleted("  -> "sv.bytes()).release_value_but_fixme_should_propagate_errors();
                     g_printer->print(value);
                 }
             }