I'm not entirely sure I follow your argument. 1.75MM rear endings occur yearly. Decreasing that number does seem relevant. Could / do these auto-brakes decrease that number? You seem to think no, per your second quote comment - I'm not sure, I haven't done any further research to see if there's a trend. I wouldn't be surprised in either direction, honestly. The ratio of accidents to "near miss" is probably hundred(s?) to one, but could this make it more? I don't know. Fwiw - I'm anti-auto-brake as a rule, but I'm just curious if the data would be in their favor or not.

I don't have an auto-brake feature, only ridden with people who do. I believe that most of them do have some sort of warn prior to brake - but to your point, there are so many situations where this could falsely trigger that it would likely end up being tuned out, at least as I imagine it. Actually, my truck has one of the "warning" things, and I ultimately turned it off for this reason. The number of "immediate danger" warnings that would flash when I was driving, e.g. alone on a country road at night, made it not worthwhile to me. I can imagine an auto-brake would be even worse that way though, lol.