Well, this effectively what Apple is trying to make now.

Unlike Apple, North's optics is so much simpler.

You don't want to interact with those things using your hands or frisbee a photo to a friend, bouncing it off of a wall? (Physics applied to a UI system aware of surroundings is so much fun!)

If it's anything like using a phone it's going to be a huge pain the rear to interact with others in any meaningful way. Just sharing a link is by far the easiest way to share anything with anyone. I don't want some fancy NFC, proximity sensing, bluetooth activating mumbo jumbo.

It might be cool but it's not useful.

Those sound ludicrous -- are you describing a real product in this space?

OTOH I think real subtle hand gestures could be a great input mechanism. The interface used by the now-abandoned "Soli" might be worthwhile. Voice interaction seems very tedious and embarrassing to use in public.

Of course but that's a different use case and different hardware. I believe we're talking about two completely different devices and markets here.

Currently, but I everyone who's tried it is blown away by how good it is. So yes, they are different devices, but I fully expect there to be huge demand, that most smart glasses will have hand tracking, and that the end of the smart phone is without doubt.

BTW, the HL2 was design for sharing and privacy from the get go. It is after all the basis for next gen military helmets