Panajev2001a
GAF's Pleasant Genius
How do developers like Rock Star account for differences between an i9 on their PC version of RDR2 and the Jaguar on the console versions?
They design the game and its systems so that they work at ~30 FPS on consoles' Jaguars first and foremost.
Then maybe they delay the PC game for a bit and, if the game projected sales are big enough (few few games are anywhere near the sales juggernaut GTA is) they may tweak the experience so gamers can get a bit more use out of the HW.
Considering the performance difference between the 1.6 GHz Jaguar and a 3-4+ GHz Core i9, you see few if no gameplay altering changes or nothing more than can be brute forced.