If that is your mindset, you’re definitely better without root. My phone is rooted for three years now and never had any issue. I never had an app fail with my methods to hide Magisk. I even got GPay and contactless payment working when I still had Google services installed. Without them, it is impossible unfortunately.
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.