Because it will be in the form of a locked down android or chromebook-alike, where you don't have root/admin access or control of the device. Turns out Richard Stallman was right again Tivoization is bad. To bad Stallman has the charisma of well Stallman rather than say Jobs, the world would be a better place.

Embrace, Extend, Extinguish.

Microsoft is not an ally Linux needs.

It may be that the cost of maintaining this humongous pile of legacy code isn't justified by the revenues they think they can extract from it.

I think this is the right answer, compared with something the grandgrandparent touched upon: windows apps from third party vendors do not act as competitive advantage anymore. (This us also due to how Windows OEM contracts work.)