It's really the last thing that keeps any trustworthy source from recommending switching to linux for gaming without reservation. As soon as you want to play any competitive online multiplayer games, which to my understanding is the vast majority of people, you're going to have problems with some anti-cheat not working on Linux sooner or later.
I'm not saying it's the only thing that stops mass adoption of Linux for gaming, but I think we'd see a massive uptick very quickly, if this problem went away.
I'm not saying it's the only thing that stops mass adoption of Linux for gaming, but I think we'd see a massive uptick very quickly, if this problem went away.