While it's incidentally true that "you don't just casually fire up a VR experience", it glosses over the more salient fact that you don't have casual VR experiences, full stop. VR is, definitionally, an immersive, exclusionary activity that places you in a virtual world and prevents you from interacting with your surroundings. Criticizing an activity like that for not being casual enough to "fire up" is like speculating air travel won't catch on because airplane doors are too narrow.