The device has breakthrough--when someone comes near (eg a flight attendant), it breaks through the immersive VR and shows them to you. You can take off the headset at that point if you choose.
Again there's a lot to question about how this headset will practically work for people, but this ain't it. In fact I'd argue airplanes are one of the use-cases for this device that makes the most sense. How many places do I want to completely disappear from my environment and pretend I'm somewhere else? A long haul flight is tops on that list.
It's unfortunate that it can't be used on planes yet, then. I saw a video where someone tried it, and apps were just left behind in space by the airplane's movement. It makes sense why this would be the case, but it also should be obvious that if you're in a sealed room, apps you open into the room shouldn't fall through the room if it's moving.
Or when someone walks past to use the washroom.
I guess we'll see how people use it, but right now it is too expensive and full of compromises for me to consider.