As I understand it xbox will stream to your PC, what I can understand Is why you would have two systems running to play a game. only thing I can think of is if you don't have a TV... I suppose the editing features and messaging would be nice on PC but I think this is just a waist of R&D money (not like you don't have enough Microsoft) when It could go to more complex idea's.
Lets say I buy battlefield 5 on Xbox digital copy. bought the game with my Microsoft/xbox account now it is linked to my account and I own that digital copy (or the rights to play it). Lets say I want to play it on my PC. why cant I use the xbox dashboard on windows 10 to install the PC version and play it on PC vs PC, or if I plug in my controller and the xbox dashboard sees this it disables my mouse in game and lets me play against xbox one or PC vs Xbox.
Why when I buy a game from Microsoft I can only play it on one game system or platform. Win 10 on PC on Xbox on Tablet on Phone... I buy tetris off the Microsoft store digital. why can that not run on all 4 plateforms which ever I choose. for the way I see it, Tomb raider on my PC is the same as Tomb raider on Xbox one. both are running on AMD hardware. and x86 language, DDR3. It would not be hard to supply the game files for different platforms.
The reason I say this is cause steam is killing everyone on the PC market. you cant compete. but this would give them a run for their money. talk about revolutionary and changing the landscape of gaming forever. heck phones could run xbox and xbox360 games as long as you purchase it digitally from Microsoft and your account is authorized to use said title. does it really matter what platform your win 10 is running on as long as it can play it?