Controls in those apps should appear only when needed, that's the mean of "Contextual". In the Windows Central app that's actually the case, a good designer on the platform, hurrah!
Adding that bar to all the pages of an app, or even worse to all the apps, is obviously stupid. They have to move those things to the top of the app where there is plenty of room.
Besides, the phone is used primarily for content consumption, people is not clicking buttons used in content creation all the day, in my case, sometimes I don't touch that bar in weeks. Supposedly only the 1% of the users in a forum or public site is a content creator.