Many of the people criticizing clearly didn't see the presentations.
Is there non-trivial risk of market failure? Of course. They are trying to create a computation and entertainment focused AR device. That is new. It is inherently risky to create new markets. Is it also possible that they have executed this so well that people may find it very compelling and buy it? Yes, that may be true. Only time will settle this question, so making extreme conclusory statements is just silly.
Real, open-minded discussions of the tradeoffs of the tech have unfortunately been in relatively short supply this week. Some folks have made interesting and thoughtful comments and I for one have enjoyed them very much. Kudos! More of that please.