As someone who almost exclusively plays multiplayer games - we are def not there. I agree with you that kernel-level anti-cheat needs to go and games should focus more on AI-based (behavior and pattern analysis) anti-cheats instead. But, it's simply not fair to to say that "we're already there" when almost 50% of the largest (most played) games out there don't work on Linux.

We are not there. Is it Linux's fault? No. But we are absolutely not there, yet.