I think part of this is that Gruber was imagining something different than what was actually in the product. He was dismissing the idea of a video surface pasted on the outside of the device that only looks decent from straight on.
And the other part is that he is correct, in my opinion, about the worth of the feature versus the cost (financial and battery life). I can talk to someone wearing dark sunglasses without discomfort from not seeing their eyes. You’ll only have very brief encounters with people wearing the headset. If they want to talk longer, they can easily remove the headset.
Of course, maybe my opinion would change if I tried the feature.
It’s not hard to ask tough questions. But asking tough questions isn’t very meaningful if they aren’t answered. In the end, this is 100% a PR event. Take it or leave it. I’ve gotten more valuable insights on the creation of the Vision Pro from a couple of Twitter threads from former Apple employees who worked on the project than from a few execs in a discussion with Gruber.
There is some difference between announcing a first generation product and a third generation product. But your point is not entirely without merit.