[handrous]

Enough battery for all-day power being able to fit in a device that doesn't look like complete shit (i.e. looks sufficiently like normal glasses or sunglasses) seems to be the problem.

However, as far as I can tell every major tech company still expects that problem to be solved and for them to be the Next Big Thing. I don't know why else they'd be putting so much money & PR into consumer AR efforts when it's niche at best, so long as you have to hold up a device to use it, unless they fully expect hardware development to come through in the nearish future and make AR glasses the next smartphone, in terms of becoming must-have and driving the next wave of human-computer interaction.