and?

potato

The point of SteamOS is a pre emtive attempt to distance reliance on a microsoft platform. Mainly to keep control over what steam decision makers consider "theirs". Making the OS a sort of, open project....free? Is to give it traction. Similar to Android.

Shut out gog? What would be shutting out?

Developers will maintain the status quo. Sticking with an ever increasing dumpster fire after another, that is microsoft.