Here are some examples of features I would like to see:
- Native Markdown viewer and editor, to replace Wordpad
- Disk space manager - graphically show where my diskspace went; allow me to find and delete large files
- Restartable and reliable file copy (similar to rsync on Linux)
- Notepad with same features as textarea element in browser, including spellcheck, multilevel undo/redo, completion, etc.
- Printing that can stay connected to printers on my local network
- Dictionary app (MacOS has it)
- Air drop compatible with iPhone
- A screenshot tool that allows you to type text (in addition to circling and highlighting and arrows)
- No system processes that randomly consume high CPU
- Command-line zip
- Instant search (Mac has had it for how many years now?)
- Stock app (MacOS has it)
- Beautiful widgets (like the old Konfabulator) https://arstechnica.com/features/2005/06/konfabulator/