There's a lot more to SteamOS than "it ran `apt install steam -y` for you". Even just having things like Gamescope running out of the box (which is more than just `apt install gamescope`) is a huge amount of headache set aside. Plus the guarantee when it doesn't work it's because of a bug rather than something you did or some incompatibility with your exact distro setup.
>guarantee when it doesn't work it's because of a bug rather than something you did or some incompatibility with your exact distro setup.
Flatpak fixes this problem. You don't need gamescope unless for stuff like scaling. The only few times you need to fiddle with anything on desktop is changing proton version or adding a launch variable from protondb.com (just like on steamdeck)
Gamescope does a lot more than scaling. HDR, better framerate limiting, non-rgb gamut handling, isolating "fullscreen" games, shader effect loading, and probably more I'm forgetting. Flatpak let's you run the Steam app itself correctly, nothing more. These "you only need to fiddle when" are exactly what add up and create frustration between users on different systems just wanting to play a game instead of read a manual/guide to find which "few tweaks" they each need to do to get the same experience as SteamOS would give them.
HDR will work soon work everywhere on Wayland by default.
You seem to think steam on Desktop Linux is somehow different from steam on steamdeck Linux. Like I said in my previous post, the only "fiddling" you need to do is copy pasting launch commands and choosing a different Proton version from a drop down _just_like_on_steamdeck.
Bazzite has gamescope running out of the box, and other distributions probably have it too.
It's also an immutable distribution, like SteamOS (except it's based on Fedora Silverblue instead of Arch) so there is no "incompatibility with your exact distro setup": you have the exact same distro setup as every single Bazzite user.
