One of the early big interviews about Glass featured Brin or Page (not exactly sure who of the two) telling that Glass is for taking POV pictures. And he talked about nothing else. While all tech guys (like me) where dreaming about augmented reality, or even just having some Android apps of choice in my view all the time while being able to walk around, all he focused on (and everyone since) was taking pictures. So it was intentional to not look past the camera I guess.