For those who wish to test out the very latest improvements to the Steam Deck, Valve has put up Steam Deck OS 3.5 into Preview now. In the official announcement Valve go over a big list of new features and fixes, so here's some of what's included.
I would switch to Linux in the desktop if SteamOS was polished for it.
Gaming and modding on Windows is already full of caveats, I'd only be willing to jump into that with Linux if there was a widely adopted and supported OS there to make sure the mod compatibility and UX was better.