Recent testing revealed that Arch Linux, Pop!_OS, and even Nobara Linux, which is maintained by a single developer, all outstripped Windows for the performance crown on Windows-native games. The testing was run at the high-end of quality settings, and Valve's Proton was used to run Windows games on Linux.
It’s in the early stages, but yeah you can do it in KDE Plasma if you’re prepared to jump through a couple of hoops (basically doing the same thing the Deck does)
Linux won’t have proper HDR support until mid-late next year.