I don't think apple would've worked on this unless they knew they can create a very useful and dependable tool.
The biggest advantage of a VR/AR headset that no one tapped it yet is the ability to have basically an unlimited screen estate in a tiny device. I see myself doing everything I do now on a laptop or phone with a light unobtrusive VR headset. Thinking of working in 3d software, coding, office work, reading, watching media basically with no screen limits.
This combined with a completely new (apple) way to interact with it. Think how iPhone basically introduced us to the whole touchscreen era, where before we used to interact using was 10 keys.