Considering switching to iPhone 13 Pro from OnePlus 9 Pro

Just want to switch phones without paying extra, because:

1. Not sure if Oxygen will get another update, but I downgraded to Android 11 from 12 (which was a complete disaster), and I don't like 13 either. So basically software support for my device is either over, or it's so bad recently that I don't want to update.
2. I still have problems with notifications across various apps. I never got to make Gmail actually work despite trying pretty much everything. Also there are occasional problems with Instagram and other apps.
3. I don't use customisation features much, different launchers etc. My interaction with file system is Just manually putting some files into the phone via USB (audiobooks etc.), and that's it.
4. I have a Macbook and iPhones/Mac sync and cross-device features are nice.
5. OP rapidly drops in price, iPhones - not so much. After using 12 Pro Max for some time I may sell it for good price and buy iPhone 15. My main problem with iOS was the repetitive design for years, but I like how 14 Pro looks and can bear a year with 12 before buying the next iPhone.

Anyone had similar experience recently, with 12 Pro Max or 13 Pro? What did you regret and what you didn't?

P.S. I'll probably miss fast charging and shelf, but I can live without it if the rest of the experience is superior.