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Yeah but we're dealing with the vestibular system here and other biological systems. It's apples to oranges.

I think that's Zuckerbg's point: he wants to be oranges. He certainly doesn't want it to be apple's.

I don't think the vestibular system is a solvable problem with VR but it is much less / a non-issue with AR. Thats why he always talks about VR/AR.