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.
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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.
That’s in the works still right now, steam deck has it and I think it’s possible to get it working on other distros but isn’t on by default in most I don’t think