I hear this all around and I am myself running GNU/Linux almost all the time, but running games on Steam on my default OS, which is a Debian with KDE currently, that is more miss than hit. I even know someone who has almost the same hardware, also runs a GNU/Linux system and for them almost all games work using Proton. For me however they don't. I already tried proprietary graphics card drivers instead of the ones that come with the OS for amdgpu, HWE kernel, another distro, using Steam installer downloaded from website ... nothing seems to fix the issue. When I click on the big green "Play" button in Steam, for many times it loads for a moment, and the button turns into a blue "stop" button, but then just turns back into a green "play" button, never starting the game. Mind, some games work, like Stardew Valley for example. But I think those are mostly already made to work cross platform.
I have no idea what I can still try, and it annoys me, that for most games I still have to reboot into Windows to play them. I seem to have had more luck following guides for using WINE for specific games in the past, when I made games like StarCraft 2 work better than on Windows, than I have had with Steam and Proton so far.
So anecdote. It is not smooth sailing for everyone yet, unfortunately, and I don't know what the issue is.