I will guess 1. MS anticipated cheap Android OEMs 2. They anticipated VR and anticipated the need to integrate 3D audio in 3D hardware, which is the grafics c

I will guess 1. MS anticipated cheap Android OEMs 2. They anticipated VR and anticipated the need to integrate 3D audio in 3D hardware, which is the grafics cards at the moment. They were involved with VR from Kinect. 3. Multiplatform is not bad. 4. DX9 is probably good enough.