OneNote on small screens defaults to a Full Screen View....
My point being that any interface on a small screen is going to be pretty naff, certainly my experience on nearly every app i've used. I'd rather the small screen guys just suffer a bit and the focus in on what the vast majority of people will be using, computers. Is this why MUI onenote has the most appaling note management system i've ever come across, because it's been designed from the ground up to be used via touch? A handful of powerpoint presentations and my MUI onenote becomes a waste of my time.
I can't stand this whole mobile first thinking. Just look at where paypal now stands. Their desktop site is a joke. Unity is great, but there has to be a limit somewhere.