iOS 15 works just fine as well. Yes there were a few bugs but they got solved in 15.1. If you buy a new iPad or Mac or other apple device those will come with the latest software be it iOS 15 or 16, which will cause a significant software gap between your device eventually. Does it take some time getting used to? Yes, but you will get used to the new features.
I'm not against iOS 15's new features and stuff. That's not the issue. I just don't want a buggy iPhone when it's working perfectly right now.
They optimize and fix bugs for the entire iOS major version, and just when it's pretty efficient and bug free, they slap you with a pile of crap and repeat the process all over again. I'm just sick of that cycle.
Yes, I know eventually I'll need to have iOS 15 or later when I get new hardware, but I don't have new hardware, so why update? I still get the security patches for iOS 14. I still have a fast OS with little to no bugs (for me).
I'm also not a huge fan of the new look of the notification bubbles in iOS 15, they just look rudimentary to me, almost childish with the giant icons that are centered vertically inside the bubble. It's just off putting to me, but that's not really that big of an issue.