Wrong, any stutter would be seen in minimum fps testing and 3070 8GB has higher minimum fps even than Radeon 6800 16GB in Star Wars at 4K maxed out. Not that any of the cards can do it, yet VRAM is not the problem for 3070 here.
Besides, like in all games, DLSS beats FSR and upscaling matters alot in pretty much all new games at this point - It's replacing AA completely, because it has both AA and sharpening built in. Even in the AMD sponsored Starfield, FSR2 was default AA solution on launch and TAA was crap. Modded DLSS/DLAA beat FSR with ease in this game (TPU tested this, go read), which got real DLSS support soon after launch because 9 out of 10 players used Nvidia and wanted it, since FSR was meh.
Also take a look at 6700XT 12GB which loses to 3060 Ti 8GB.
Are you refering to those AMD sponsored rushed console ports like TLOU and RE4 that was fixed long ago? Pointless to keep bringing them up, they have been fixed and they had memory leaks going on. They ran bad even on AMD hardware. Thats a rushed port for you.
Reality is that most new PC games just run better on Nvidia cards. How do I know? Because I had 6800XT before my 4090 and it was a very mixed experience, with high hotspot temps but AMD says 110C hot spot temps are "within expected range" haha