From a usability standpoint. Do you expect everyone to wear glasses? Are people going to all be out in public talking and doing hand gestures as input to their glasses? You don’t need to cater to different people who need different prescriptions for their fingers and for me, I have prescription glasses with two separate prescriptions and transition lenses.

Automagical AR glasses are also probably a couple decades out for various reasons. Maybe we'll see more weirdos wearing goggles around but I don't see useful mainstream fashionable classes around anytime soon. And, of course, lots of privacy implications, i.e. here's the profile of the person I'm looking aat.

They will be talking but not speaking