You say "especially" when it's more like "almost exclusively". Almost all games not bundled with malware (kernel-level anti-cheat) work with zero or minimal tweaking. It gets a little harder if you like to play with mods, though.

Linux gaming has come a long way. Back when The Witcher 3 came out, there was no Proton and running a game with Wine involved a lot of tweaking. Even then, I got better FPS than in Windows but it was hard. Now, I don't even think about it. I just assume it'll work.