> My notes in Apple Notes belong to Apple Notes, not my filesystem. My texts live in iMessage's database, not my Documents folder.

This is why as a Mac user I don't use those apps. Nor do I use Photos or whatever iTunes is called now. I've been burned too many times by having my work locked away in some kind of proprietary Apple database. Yes, you can usually export stuff but that's not a solution. You export your library on Day 1, do some work, and then export it again on Day 2. Quick, what changed? Where's the primary source of truth?

File systems are universal and files are portable. Any app that uses a proprietary database as its primary source of truth is an app I won't be using.