“Powerful PC gaming in an open ecosystem”
Valve just kicked the teeth of all console makers with this announcement. If only they manage to ship and distribute globally they would single-handedly threat taking over the entire gaming industry (hardware side) in a single generation. Of course, it's well to wait for reviews, hands on demonstrations and the reality that comes out of this. But I bet there's more than one MS an Sony executive who were apprehensive of seeing this day arrive.
Also: the fact they doubled down on the Steam Machine name. It's like a huge FU to all OEM manufacturers who laughed at them in 2017.