Apple's headset was sold as mixed reality, I don't even know if it can actually do VR and play VR games, and mixed reality is not that interesting actually. If you think VR games aren't interesting even though they are full experiences nowadays like Asgard's Wrath and Into the radius, MR games are legit minigames.
One killer app that I still haven't found is the ability to scan a living space and then make virtual modifications. I've got an idea to expand my kitchen and want to walk around it, and you'd think a VR rig that can scan rooms could do this. But I can't find any app to do this on any VR platform.