This can only be known after the fact. To complain about "this obvious treatment that obviously works but regulations delayed for 10 years", is as valid as to

This can only be known after the fact. To complain about "this obvious treatment that obviously works but regulations delayed for 10 years", is as valid as to complain about "this obviously flawed treatment that kills one person out of ten people and killed my husband, because obviously not enough testing was done". The error in both complains is to assume that the answer was in anyway obvious. It was not. It almost never is. I agree with you, totally. I just wanted to emphasize that point.