You seem very misinformed so I’m just providing you with resources.

https://github.com/ValveSoftware/gamescope

On many distros it is.

Lol I was willing to give you the benefit of the doubt and assume you meant that gamescope would be difficult to get working under Bazzite’s immutable architecture.

You do realize gamescope is just a package you can install, right? Do you think it’s a unique feature of SteamOS or what?