With the advances in gaming on Linux in recent years, it is so tempting to switch full time. I would absolutely love to, but I am a Game Pass Ultimate subscriber and it is where I play a lot of my games on PC. I know you can use the cloud version, but I cannot stomach streaming games in their current state, so it is a no go. A large portion of my Steam library is compatible, but anytime I have done an install I end up giving in and going back to Windows for games.
Its probably a mixed bag and dependant on what games you play (and your GPU).
I just dual boot. I use Ubuntu (currently 22.04) for most things like work etc. Using it now. And when I want to play games I use Windows.
That said, i Do have a mac as well, for recording music. I have considered moving to something like Renoise on Linux. Definitely wont be on windows.
All told, im not a evangleist for an OS. I just stick to what works for the task at hand.
Proton CAN play a lot of games. I believe its how the steam deck works too. So its probably more feasible than ever to run a gaming rig on linux. But ive been down that road before, and its been a fools errand for me.