You keep mentioning this imaginary 3 minute hard upper limit
The 3 minute clip limitation is right here on their site.
You weren't arguing that it would be fine if you could record more than 3 minutes, but just of somewhat limited use at the moment.
Okay, let's imagine your sci-fi realm glasses exist. They can record all day long due to some amazing advancements in battery chemistry and/or semiconductor efficiency. We're already pretty much there as far as flash memory goes, so there's at least that. The part you're failing to consider is the potential for self-incrimination, because the glasses are recording everything you do, too. Rolled through a stop sign? Hit the high seas for a TV show? Forgot to scan an item at self-checkout? Smoked a joint after work? And don't even think of turning them off, because if you have nothing to hide you have nothing to fear.
Unlimited recording doesn't make the glasses more useful - it makes them more dystopian.
You might *think* that bodycam footage solves this problem perhaps? It doesn't, because that footage gets "lost" anytime (or at least all too often) when they want to break the law.
A pair of smart glasses is going to become "lost" in exactly the same manner if a LEO decides they want the footage gone.
Finally, if you don't see how having footage of an entire interaction
As I already said, even if you solve the issues with the technology, recording every single interaction throughout your daily life creates the potential for a whole new set of potential self-incrimination problems. These problems are far more likely to occur than the off chance someone wants to fraudulently claim you've wronged them in some way. The famous quote "If you give me six lines written by the hand of the most honest of men, I will find something in them which will hang him." comes to mind.