I think it's a bit of a useless feature seeing as It requires an Xbox One and when you're playing it, you're more than likely gonna want play the games on your TV.
True but sometimes you don't have the ability to do that. Someone else might be occupying the TV. So if you have a tablet or laptop, you can now play anywhere in your house
It doesn't let your house mates watch TV while you are streaming so I think it's a bit useless at present. Your stream takes over the Xbox, which is used for TV, so 2 rooms become dedicated to a single game.