The last missing piece for full Linux gaming is anticheat. Last I looked into it, the major vendors don’t want to support it due to lack of kernel security and the ones that do, game devs refuse to allow it (destiny for example)
One we can play AAA games I am literally ditching windows forever. Steamos is the best thing that has happened to gaming
Don't forget the ancillary applications that gamers want. If you follow Discord's website, you're gonna end up installing a DEB file manually. Then, every couple weeks, Discord won't launch until you go download another DEB file and install that. Oh, and good luck getting Discord screen sharing working on Wayland. I tried for hours, gave up, and switched to X11. So, just in Discord, we've already run into two hideous workflows that no Windows native is going to take in stride.