Can they make the system even better by finding cases it didn't help? Almost certainly. Progress isn't a straight line, but increases are increases.
Where did anyone say "isn't worth it"? The sentence I see is "The problem with numbers is that they don't tell the whole story."
Though in a more general sense, if someone does invent a system that has strong average safety gains, but makes the majority of people less safe... that's a hard sell.
Logical fallacies like the base rate fallacy are real, and they fool all of us frequently, myself included.
Literally the same arguments were and are made against seat belts. Often. And is why I am not too willing to give way here.
Now, if you are just saying, "I hope they keep their eyes on the data and are willing to keep improving," great. I agree. If you are trying to angle it that this is not a safety improvement, I will loudly disagree.
Yes they do impact things.
Consider a pill that, given to a wide population of test subjects, reduces heart attacks by 20%. That's great! But when you look at the data more closely, it strongly reduces the risk for people older than 40, and it increases the risk for people under 40. Should you prescribe that pill to everyone at risk of heart attack? Of course not.
Does AEB have a pattern like this? Who knows! Someone should test or cite a good test!