Another issue is the announcement triggering all the other devices. That's been a basic failure case from day 1 of voice input. They apparently haven't added anything to handle that. It's not too big a deal when the voice assistance is at a home, but smart glasses are meant to be used all the time. If all you have to do is yell a command they're going to have a major PR problem. It's less of an issue with phones as they're often locked and in your pocket, but a nearby glasshole is wide open.
Can't wait to try this in public transportation: "Hey Meta, play "Never Gonna Give You Up"!"
The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth. -- Niels Bohr