Apple's dev guidelines for the Touch Bar recommend that dev's avoid using the Touch Bar for status output. They clearly want dev's to make their users touch the bar. Feel it. Interact with it on a physical level.
What that means for dev's that go against those guidelines is anybody's guess right now, but I suspect Apple will eventually pull any apps from the App Store that simply display status.
You'd think status would be a nice feature for apps people like to use in full screen. Maybe send notifications there when in full screen? Using it to just not clutter up the main display seems worthwhile, at least for some.