The Glyph was simply a display with speakers. I agree that the form factor visually pleasing, and they weren't uncomfortable to wear (save for extended periods, where it was easier than even with VR sets to develop dry eyes), but adding in everything necessary to make them a true AR/VR headset with inside-out 6DoF tracking, let alone the SoaC, would have drastically changed its shape and size.
It doesn't have to be a "true AR/VR headset" to become a hit if it can enhance activities like coding or media production on a mobile device by providing a screen alternative.
