Maybe I didn't emphasize sufficiently just how many games don't work for me on GNU/Linux. Out of 100 games, I estimate that I get 3-5 games that work, while many people in my circles are proclaiming how great the support now is, that so many games just run fine.
I actually have more luck getting games to run when I myself make WINE prefixes using WINE and try running games that way, than running any games on Steam. Only very few games work with Steam on Linux for me. This is also part of the reason, why I think something Steam does with Proton prefixes might be the reason it is broken.
I also tried things like not putting games in my Steam library on an NTFS drive that is shared with Windows, and instead put them on my GNU/Linux partition in a new Steam library. Didn't help. Tried various Proton versions, including experimental ones. Didn't help. Simply nothing seems to make a difference.
That’s absolutely not a normal or expected experience whatever. A standard, normal Linux install (not any weird experimental stuff like trying to install stuff to ntfs drives or running super arcane or unusual setups), just your normal standard out of the box setup on Fedora/ubuntu/arch etc should run about 95% of your library assuming you don’t have a bunch of anticheat multiplayer games which have purposefully blacklisted Linux. I’d wipe your entire drive (including windows) and start from fresh with a standard install and you should have no issues.
Protondb is the definitive guide to what works and what doesn’t and the numbers will align with the above.
I actually have more luck getting games to run when I myself make WINE prefixes using WINE and try running games that way, than running any games on Steam. Only very few games work with Steam on Linux for me. This is also part of the reason, why I think something Steam does with Proton prefixes might be the reason it is broken.
I also tried things like not putting games in my Steam library on an NTFS drive that is shared with Windows, and instead put them on my GNU/Linux partition in a new Steam library. Didn't help. Tried various Proton versions, including experimental ones. Didn't help. Simply nothing seems to make a difference.