For me the meta sunglasses have two killer features. Taking candid pictures of my family is extremely easy, I no longer miss catching photos of small things my toddlers do and I'm able to do it hands-free. Additionally, they work remarkably well as headphones, they use some technique where only you hear the audio which is great both for music and for watching videos in public without bothering other folks.
I'm surprised the candid picture case is so compelling. I can pull my phone from my pocket, double click the power button to enter camera mode, then tap volume button to shoot, very quickly. Under 2 seconds easily.
Guessing based on what I see: The act of simply pulling out your phone can break the moment. Kids tend to zero in on it immediately, making it the new center of their attention.
I dunno, I have lots of photos of kids on my phone just like I described. It's true, sometimes they do do that, but also, because I take so many, they got over it.
Don't forget having to frame the shot, making sure it's in focus, ensuring your subject doesn't get distracted by your motion, and not fumbling your phone in the hurry to capture the moment... as opposed to pressing a button on the glasses you're already wearing.
I mean this as unjudgementally as possible, but the first reason is super creepy no matter how well intentioned your use case is. I don’t think we were meant to prioritize capturing the moment so highly.
