[gt384u]

I think I understand the motivation behind your comment and I'd agree to some extent, but designers still have the mantra that users need to be involved in the process of design. For some design practitioners, it's maybe ensuring that designers write personas and scenarios for different types of users or engage in narrative-based design exercises, or even (if you're the right sort of weirdo) participatory design.

I honestly have no idea what stage this project is in. Are they in a phase that's more ideation? Are they refining in their design funnel? I think it's a bit curious to point at an example of a product by one company and say essentially 'They did it this way and were successful, clearly this is how all things should be designed'.

I'm not sure this is an issue of them asking a question analagous to "What do you want the iPhone to do?" so much as it's maybe "How annoying are people who aren't researchers and designers going to find wearing HUD glasses for 3 hours a day?" or "Will people feel uncomfortable using them in pedestrian or cycling settings given that they're voice-activated and pervasive?" Granted, there are maybe analogous products on the market that will maybe inform how people will interact with this new medium, but I have a few years experience interacting with someone using this sort of one-eyed projective displays (my former research advisor wore one) and there are some funny things involved with face to face interaction with someone using them that you might not anticipate. In fact, he felt that the eyepiece was often enough of a social interaction barrier that he'd take his off and tuck it into his shirt pocket when he was having a conversation.

You're not necessarily going to figure these things out in the product design lab. Maybe it's stupid of Google, but I suspect they're trying to better do design for the wild. Alternately, they're just people who don't know how to make products.