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.
I'll add that the DX11 version is reportedly offering more stable performance, unless you really want to use Vulkan, it should be preferred.
Even for 1080p media, playing locally with advanced denoising and upscaling to 4k is so nice, and of course just not having to deal with all the streaming caveats.
For games pirating it for performance testing is useful before you know you'll fully commit to it, although Steam let's you play for up to 2 hours and still get a refund, a lot of games will require you to play more of it to make that decision (looking at you, Starfield... I'm glad I didn't buy that one).
I am actually pretty hyped for this one! Looks amazing!