I agree with your points, and teams should be freed to compete without having to prop up Windows, but that doesn't mean that Microsoft shouldn't have a presence in mobile. Specifically, I think they should build a pocket PC: https://medium.com/@karti/microsoft-should-launch-a-pocket-p... Not a smartphone, not the old Windows Phone 8, not an iOS or Android clone, but a Pocket PC, as the link describes. It's important, because using a Google or Apple platform drives you to using Google or Apple apps.