Windows still have the gamers. A lot of anti-cheat system completely block out Linux users. The Year of the Linux Desktop will still be a meme at the end of this year as well.
Meanwhile, 84% is perfectly playable (some with minor tweaks).
Never had an issue with any game running through proton. Only issue was Stardew Valley that couldn't play online. Turns out the Linux version (was default) had an unfixed bug, and choosing the Windows version with proton "Just Worked". Hilariously, "Win32 is the most stable Linux ABI"...
Of course one point here is that MS owns some of the more problematic game studios. Anti cheat here might be less about users cheating and more about them using this as a control point to ensure gamers keep on preferring Windows. It will be interesting to see how this plays out. I don't think MS has much of a moat left for gaming. And it will be tempting for them as well to tap into the few percent of Linux using Steam users for selling them games. They've long stopped insisting on windows for things like Office or SQL Server as well. The whole of Azure is pretty much Linux based at this point. So, they might dig in for a bit but they'll be under growing pressure to give in.