Fedora Silverblue.

Or really any immutable OS; they would have to go way out of their way to even edit system files, much less break the system. I just recommend Silverblue because gnome is really hard for an inexperienced user to break.

Because it’s not “just a fancy interface”?

It makes the entire process from purchase to playing completely painless, on top of a large community of people, guides, achievements, etc. I think I’d maybe improve my performance by like…a fraction of a frame per second. Good trade off.

And as others have mentioned, Lutris does a good job if you don’t want steam.

Bazzite and Chimera are “SteamOS-like” distros that are more focused on providing a game console like experience.

They’re immutable operating systems, and the primary UI is Steam. Definitely usable as a desktop PC but that isn’t really their target niche.