AR is a separate line of development. Being able to label the real world has many use cases. There are many industrial applications. The big technical problem is getting location information good enough to register the annotations on the real world. That's not solved yet for big spaces.

In AR, the graphics don't have to be as good. Text and line drawing alone would be useful. This translates to less-clunky headgear. The Microsoft HoloLens is far less clunky than the HTC Vibe or Oculus Rift. Being able to walk an oil refinery or a server farm or a WalMart and have displays of what everything was and how it was doing would be valuable.