Comment by pjmlp

Valve is the one making most of the work, devs target Windows, business as usual.

WinRT now runs on Win32 side as well, that is what new APIs like Windows ML, the abstraction used for all kinds of AI infrastructure now use, just as one example.

Microsoft Games Studio will do whatever they need to make shareholders happy, and if Steam gets in the way of XBox handhelds, maybe a change of heart will take place.

Who knows, Valve is the one that needs to worry, not Microsoft, they control the technology.