Like if Microsoft released their own Linux OS, would it be good suddenly?

It’s worth noting that steamOS, like any Linux distro has its issues and a bit of a learning curve. Especially if you want to go off the beaten track, it’s pretty much just using a stock arch distro.

As for if MS switched to Linux, no it wouldn’t be good because the issues with Win11 overwhelmingly aren’t a matter of incompetence or anything inherent to the code, but of conscious anti-consumer business decisions. There’s nothing about Linux that would actively stop MS from cramming telemetry, bloat, etc. In their distro.