Your comment resonates, but one issue with Apple Notes is that functionality is very limited on Windows and Linux. Apple doesn't expose any APIs for Notes so it cannot be integrated with ChatGPT/Codex/Claud. At best there are community plugins which scan the local DB running on a Mac. This would not work on iPhone.
Functionality is great across Apple devices. I think they are really adamant about their lack of interest in making their platforms open to other OSs.
You're right on there not being an API, but...
Both Notes and Reminders have a full AppleScript / JXA interface that Apple has maintained for years. Any LLM with shell access can read notes, create folders, add reminders, mark them complete, etc... + iCloud syncs everything out to iPhone/iPad/Watch/Vison/whatever-comes-next automatically.
Thanks! I'll take another look and see if I can live with the limitations. One recommendation I got from this submission is Anytype, so I'm also scoping that now. I feel like I've test-driven a hundred apps over the decades :-/
I would love an open, cross-platform Apple Notes.