We have keyboards and mice
Hopefully this will be the first of MANY applications to lose the UI design idea that assumes "all the world's a tablet." Computers with an upright screen, keyboards, and mice, just don't fare well with "touch optimized" user interfaces. We don't like ribbons and obtuse full-screen UI that only looks good on a tablet or phone.
It seems that Microsoft, of all people, forgot that their operating system is called "Windows" for a reason -- it's supposed to display windows. I would like to see all of their software return to UI that is optimized to display in a window. Imagine that.