My wife had fair phone 4, and it was unusable. It was only time she replaced a phone prematurely. She cares a lot about camera though, and likes to take pictures. Her main complaint was that the camera took like 5 seconds to start, so she'd miss the moment. And when it did finally start the quality was really bad.
I tried using it a bit but I couldn't stand how unresponsive it was.
I don't know if their later phones have gotten better,I hope so, because I love everything about that company except their (previous) products.
I think Gen6 should be good enough for basically everything from what I read, but I haven't tried one live yet. The other option is a Pixel 9-something once the 11 is out. but I like the e/OS support of the Fairphone and at some point I want to jump ships.
The fairphone 6 is much better! I've found it to be pretty snappy and the screen quality is nice. Can't speak to the camera quality, but the startup time is not slow.