Having been on Linux for over a year now, I don’t. It’s still plagued by instability, weird bugs, and big limitations whenever non-Steam games are involved.
You mean games that arent available in steam at all, vor those which you haven’t bought there? I found the easiest workaround for me was to simply add the games to my steam library and to launch it from there. Then I don’t have to worry about what proton version I should use or whatnot.