I am mostly fine with my FP4 that I bought end of 2021. I knew that I would get medium hardware for a slightly higher price. That was OK for me and the expected “sacrifice” for being more fair.
The thing that bothers me most is an issue with battery drain that seems to be connected to mobile data (in German: 🇩🇪 Batterie entlädt sich im Standby Modus extrem schnell). Without mobile data my (initial/first) battery lasts 2-3 days which is fair, I think.
Some recent events related to the A15 update gave me some trust issues: The random reboots with the initial update (Reboots after A15 upgrade) and then several bricked phones with the next one (see Software Update: FP4.QREL.15.15.2).
I never experienced problems with the A13 updates and I appreciated the advent of A15 but I think I will be much more careful now and wait some time and check the forum before updating 
But all in all I’m satisfied and I hope that I can use this phone as long as (sanely) possible.