> I have access to all of them on my phone via Files app and the iCloud sync
TIL that "unsaved" TextEdit files automatically go to the iCloud/TextEdit folder! That changes things for sure. (It also means that there is no such thing as an unsaved TextEdit file.)
Have you given Stickies.app a try? It is designed exactly around this model (notes are never "saved" in a true sense, they just live all over your desktop, what you can do is export / import text however).
Also, I have access to all of them on my phone via Files app and the iCloud sync, this is surprisingly practical.
[1]: https://en.m.wikipedia.org/wiki/Mission_Control_(macOS)