I upgraded from a 7 to a 14 pro and while it doesn't hang up on the newer OS as much (a problem the 7 developed over its lifetime), it's not really an appreciably better experience overall. The camera is nicer.
On the 7 Pro, stuck on the oneplus navigation gestures, pop up front facing cam. Fully working phone, still no other phone to replace it when it comes to having a screen without a bump. And I can get a free phone through work, but there isn't one I want yet...
I switched from the 7 pro to 10 pro just to double my storage and have a better camera. For actual use as a phone, there wasn't a need to upgrade whatsoever.