There are distributions with a great Steam experience out of the box? It’s SteamOS actually a good choice? Maybe isn’t what you use or prefer.
A good Steam distro for me has a very mininal procedure for perfectly working controllers, client and general user experience.
Your direct test and experience are very appreciated.
The desktop environment is clunky at best and the default GUI is 100% proprietary. I own a Steam Deck and use it near daily in both modes. If that’s the most polished I shudder to think what you normally use. The other guy linked Nobara I think? From the home page it looks like a pretty decent option.