For example, you already have Google Maps to guide you around your city with turn-by-turn audio navigation. That tool doesn’t get any better when it’s smack-dab against your eyeball.

I don't see why a manual for an airplane mechanic is better smack-dab against his eyeball but a map in one's line of sight is not better for a person navigating.

Her claims that Glass distract you from reality are counter to Google's thesis that Glass frees you from the distraction of staring at your phone. Both claims could be true, but I haven't seen much evidence regarding Glass.