As a user though, why would I get an operating system / device that can only run Android software when I can get a device that can run both Android and Windows software?
And as an Android dev, I now have an incentive to optimize for Microsoft device form factors, which is a lot easier to do and maintain than making a whole port
And I don't see that there are too many developers who are now writing Windows desktop apps who will suddenly decide to rewrite for Android. Cos what apps are native? Stuff like CAD software, Unity, Photoshop, etc - stuff that has heavy complex UIs and wouldn't work well if at all in most Android contexts