Interesting! That is not my experience at all. My only issue has been the right click contextual menu behavior being inconsistent with google docs and VSCode. I hate to say this but have you tried a fresh install? I did to that and it resolved the issues I had early on, and then once I restored my backup it was fine.
iCloud sync (won’t sync my photos until I restart).
Sharing (can’t email stuff unless I restart. Just stays at the “preparing” stage).
Search (both iMessage and spotlight).
Safari is incredibly unstable and tabs or the whole browser crashes all the time.