FWIW, I've checked a few near-misses, and I can't find anything that looks super confidence inspiring. Sure, it might be better than those not paying attention at all, but while that's a win on average, it should beat the most attentive and the most capable drivers before we consider the tech top-notch.

Reaction time in all the car-braking studies is usually measured at 0.2-1s.

That's indeed the time a computer can use to their advantage, and maybe Teslas do, but many in-car systems today are not that fast, and esp not the one in my Volvo. All the things it does it seems to do them slightly later than I'd like to for a seamless, defensive drive.

It's all a matter of cost of per-unit hardware (processing power), development time and state of the art.

We'll get there, but we are not there today.