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.