I agree with your post in it's entirety, except for the bit on battery life as I spoke to an engineer using Glass a few weeks ago and 5-6 hours with real world use was the toted number (for a mix of Wi-Fi and Bluetooth use).

I still feel that is very poor though, for Glass to really be useful it should last a long working day, and ideally all of your average waking hours.

It remains a bluetooth headset with integrated display and camera. The phone and some remote servers do the real work.