Would Valve actually ever make SteamOS available though, given it’s one of the key benefits of the deck? They’d be handing it to competition who can probably undercut on hardware. It would be nice of course but I think most of the underlying tools are available across popular distros.
I moved my main PC to Ubuntu and whilst game compatibility was surprisingly good, for older windows titles that I play a lot, there was always an amount of ‘work’ involved and some had unpredictable issues. Others performed better on Linux. Also not sure about things like VRR, I need to test that.
We need eventually some gaming focussed distro to break through and get a critical mass of a user base so it’s updated and easy to use. Not sure I’m aware of a clear choice yet.