The flop of Google Glass cemented in my mind that smart phones are really hard to beat. It's a small device that's easy to carry with you, has a large and detailed display, allows custom programs, and is easy to put away. I consider it a useful thing that my phone's display and my vision aren't blended. I can focus on reality, or look at a web page. I never really need to do both.

A dedicated AR device just won't be worth it to most people. It could be a revolutionary tool for certain industries and professions, but it sounds like Meta's aiming higher.

>The wristband uses differential electromyography, or EMG, to measure electrical pulses in the arm’s neurons, essentially creating the effect of a phantom limb the wearer can use to interact with the glasses. The result is that someone can essentially think to type or control a virtual interface

This would be a game changer, though.