Because part of the library won’t work, some will work but with tinkering. They would have to build some sort of verified system like Steam has. It’s not just a fix one problem deal. Without that they open themselves up to all sorts of consumer complaints.

And here’s the thing, Xbox has lost the console war yet again. It’s a lost cause atm. I wouldn’t be surprised if Microsoft were working on abandoning the living room console space for a hand held like the Deck. Have that work with gamepass out of the box and they will sell. Microsoft have spent years in mobile windows UI, it’s not too difficult for them to do it. They are long established hardware manufacturers. It really wouldn’t take much for them to enter with a big rival to the Deck.