I was more nitpicking his "Why not just use streaming like Steam?"
Because Steam already has a "low-cost" option out there that they replaced with an even MORE low-cost option. 
As for using this with the Shitch's "connectivity" thing, it should be fine in HD provided the monitor here/on the tablet is 1080p, which it should be since most phones do that now a days. They just take the DeX or however it's spelled Samsung "PC in a phone" tech and just expand on that by making it duplicate the screen and have the OS perform there just fine.
Cooling is the major issue though. With Wifi, Blutooth (for the controllers) and other things in it like the CPU/GPU it'll heat up for sure. They need a good way to vent that heat if they want the hardware to last a lo--Hahahaha, I can't even finish that sentence with how planned obsolescence things are.