[zurn]

I don't think any Eureka moment is needed to find high value applications to implement. Just nobody has executed well enough yet.

Even if you think conservatively and consider only vr-ifying apps we already have: For VR, some types of games (Elite Dangerous, Until Dawn), applications directly related to design of real physical environments and objects. For AR there many obvious industrial applications even with simple overlaid indicators, eg in inspection and manufacturing. In AR games there are also many quite obvious concepts that should work (think eg party games or outdoor games) and you would be way off to say "we haven't come up with any worthwhile games" at this point.