Valve has confirmed that it is working on bringing SteamOS support to rival handheld devices like the ROG Ally. Dual booting into Windows on the Steam Deck is still far away, though.
Any particular reason you would want SteamOS on a desktop over any other distro? It's pretty much designed for console use, I would not recommend it elsewhere.
Because you want the console experience? A PC can be hooked to a TV as easily as a console, but it's way more fiddly way more often without appropriate software support.
Much easier to bring it to a handful of carefully chosen devices with standardized hardware first. Also there are great distros for desktops that essentially do the same already, like Bazzite, ChimeraOS and Nobara
Do you have any experience with these? I'm not out here looking to be a master penguin, I just desperately want to play to games, maybe with some mods, without having to dedicate 3 hours to tech support every single time I launch