SD was only successful because most users don't need to do things Linux is still poor at, such as printer compatibility, sound driver compatibility, and specialty software like music and video editing. The stroke of brilliance is having users buy an additional device instead of replacing their daily driver.

Its success seems to be about 5 million units (of which 2 were mine, mind you) as of last estimation. Given how reticent they are to reveal the price of Steam Machine, I doubt it would do better. I think they just bought a bunch of junk from AMD because that strategy worked for Switch 1 and Steam Deck. And even if it's successful I think it's odd to frame it as an example of monoculture breaking when Valve/Steam is a veritable monoculture. It's like a modern Apple user still thinking they're the guy throwing the hammer at the screen.