But in a noisy environment - not even that noisy, just kind of any noise at all - I'm functionally deaf. My child was telling me something while rubbing two balloons together and I had to get her to put them down before I could parse what she was saying.
I know there's obvious privacy issues with this thing, but man, it would be great to be able to pop in a pair of earbuds and be able to hold a conversation with someone while cars are driving nearby.
If all the processing is on-board, I don't think there'd be privacy issues beyond noise-cancelling headphones.