Only 10fps is a BIG difference at 4k. 35fps and 45fps feel vastly different with 35fps definitely not being a smooth experience. Even the consoles are moving away from 30fps now.
I used the tuner to alter the clocks on my 6700xt to test your theory, 35+ seems smooth enough on ghost recon wildlands and f1 2020 and others, I can't detect any jerky motion? 45fps+ seem about the
same, nothing noticeable. 60 fps+ is a bit smoother but nothing major.
Consoles had that cheap slow hardware, but still was playable at 30 fps, now they are getting faster hardware due to tech/prices filtering down.