PC games are software.
Unfortunately many PC games are also like this, astoundingly poorly optimized, just assume everyone has a $750 GPU.
Proton can only do so much.
... and Metal basically can't do that that much.
Look at Metal Gear Solid 5 or TitanFall 2, and tell me realtime video game graphics have dramatically increased in visual fidelity in the last decade.
They haven't really.
They shifted to a poorly optimized, more expensive paradigm for literally everyone involved; publisher, developer, player.
Everything relating to realtime raytracing and temporal antialiasing is essentially a scam, in the vast majority of actual implementations of it.