Finder is bad enough on its own, but the 1:N mapping from logical directories to filesystem directories (like photos, home, applications, etc) makes it essentially unusable without spotlight.
Notifications are flaky as hell (missing phone calls and messages from contacts, but displaying explicitly blocked spam sms).
Copy paste between devices has never worked right.
Which part of the OS is not terrible in your experience?
Edit: also, compatibility with video games (even ones released for macos) is abysmal. It’s much worse than Linux’s ability to run the Windows version of MacOS native releases!