I've only had a couple weeks in rentals with automatic emergency braking, and was very nearly been rear-ended twice due to false positives. Anecdotal, and I'm sure they'll improve with time, but I would never allow the system I experienced anywhere near a car I owned. It was profoundly unsafe.

Some years ago, I was in a major crash. The traffic in front of me stopped, I braked hard and stopped in time, the truck behind me rammed me into the car in front. Nearly killed me.

Some time later, I was on a snowy road. The cars in front of me stopped, I stopped, and checked my rearview mirror. There was a truck, who clearly wasn't going to stop. I pulled off to the side, and he hit the car in front of me.

>was very nearly been rear-ended twice due to false positives

To be fair, if the cars behind you had automatic emergency braking you would be at much lower risk of getting rear-ended when there's a false positive.

Assuming you're already stuck with such a vehicle, is there any benefit to a dashcam that captures the alert-noises to prove the that you, the driver, never chose to brake unsafely?

I realize this relies heavily on the questionable sanity and ethics of insurance companies. Even if they agree you aren't personally at fault, they'd probably just increase the premiums for everyone with that model, rather than sue the car manufacturer.