

SteamOS is a linux distro based on Arch Linux, similar to any other. It’s a amalgamation of different pieces of software, including a traditional desktop environment (plasma). But it does not boot into the desktop mode by default, instead it boots into their own graphical environment (gamemode) by default, running their steam client.
That’s because their main focus is gaming machines, and that’s why they want gamers to be greeted with a consolized, 10-foot UI.
I think you’re confused because you think of steamOS being the UI (i.e. “Desktop Environment”) that welcomes you when you boot into it, instead steamOS is the entire package, including a “traditional” desktop environment (which is KDE Plasma), as well as their own (gamemode), etc.






You can only teleport to Tirana, not back