Yeah, it’s been a while:

- Music (the app, not the service): almost unusable UI/UX, sync problems, two search fields, etc.

- Calendar is confusing, glitchy UI.

- Mail is a disaster… even the simple search filter doesn’t deliver as expected.

- Safari “Inspector”: will swallow async errors, unusable for development.

- Control panel: messy, ugly and slow.

- Spotlight: was good, doesn’t work so well anymore (web results, why?).

- Finder: visual glitches, extremely slow in some contexts (file list doesn't update).

- (pre installed) tools and commands slowly disappearing from Terminal/Shell

In general all the nice little touches and the refined experience are gone…