Yeah, I dunno. I think people automatically expect higher framerates on PC, but like you say, on PS4 30fps seems completely fine. It seems like people are having issues when opening the game up to running beyond 30fps, say 60fps, so it seems like maybe the game isn't very well optimized on PC yet, but may be fixed via patches. The other thing is, there are more settings on a PC version versus PS4 which may impact things.
I guess so but we'll wait and see.. I am yet to do the Proving and its after that that most of the reports of crashes seem to happen. We'll wait and see.