> the concrete reality is we can simply play more games on Windows
If you play older games, particularly DOS/Win95 era titles, the concrete reality is that DOSBox and Wine have better compatibility.
Even some recent games, eg. Elden Ring, have unfixed stuttering issues on Windows that were fixed on-release in Proton. I'm willing to give Windows it's due because I don't think it's a terrible gaming environment, but it's a direct downgrade for a lot of the games I enjoy playing.
I should've said games which came out this century, perhaps I thought that was implied when we're discussing modern anti-cheat. The number of games which work better on Linux over Windows is small.