I'm aware of that, but it is much less obvious whether glass is recording or not than whether a phone is. If somebody is pointing their phone's camera at you, they could be recording you - that's quite noticeable. Glass won't necessarily have any visible signs that it is recording.
It's been confirmed that it has a blinking red light when it enters record mode. Doesn't make your point any less valid though since its the perception that counts. It'll be interesting to see if it can get over that wall.
In addition to the light that others have noted, it's hard to understand why one assume that staring at someone is not obvious, but ubiquitous experience of having someone fumbling with a phone nearby is "quite noticeable" as a signal that you could be recorded.
