I suspect you'll be disappointed or frustrated by SteamOS, since Valve isn't really all-in on maintaining a universal distro like other projects (and that's okay); more likely, it will always be Valve-hardware-first that just happens to work on some other hardware configurations.
IMO, you're better off jumping into whatever distro interests you rather than expecting SteamOS to fit your use case. My personal choice was CachyOS for daily use and gaming, and it's been great, but PikaOS would be one I'd consider for another build. I also run Bazzite on an older laptop for some light gaming and HTPC stuff, and that's been rock solid.