I have some games I play that do not play nice with Proton. In particular, my wife and I are pretty obsessed with Solasta: Crown of the Magister (over 500 hours and counting), which has poor compatibility in wine and proton to my understanding.
Besides, for now I don’t need the hassle. I boot up gaming PC, Steam launches, I play, then I shut down. I don’t need an excuse to leave the gaming rig powered on when I’m not using it. Maybe if and when I end up rebuilding it.
That was just one example. And I’d you review that page you linked, they don’t all disagree, there were more than a few reporting issues with it. It’s gold rated, but not platinum.
I’m glad you’re enjoying the experience, but either way the point I was making is that my gaming PC is just an appliance. It works and I have enough other things to do that I don’t feel like reinstalling the OS and a butt-ton of games.
When I need to do a rebuild/upgrade in the future I’ll likely revisit Linux with it, but until then I don’t see the point. I only turn it on a few hours a week to game and otherwise it’s off. And when it is on, I just want to game, not potentially spend time fiddling or troubleshooting if something isn’t as expected.