I see a lot of comments underscoring the possible eugenics implication of this, but I am curious as to why everyone always paints it as a negative? Even in our very diversity-conscious institutions we can generally agree that some things are plain bad. You don't want a blind or deaf child. You don't want one with down syndrome or deformities that would just make their life difficult.

I wonder if the high level of opposition to this does not come from us being naturally scared of becoming irrelevant. A society capable of producing disease-less 120 IQ adults would progress faster.

Yes there are a ton of ethical concerns about building a society where hierarchical boundaries find their justification in science, but I see these arguments as myopic. Inequalities have always existed, the only difference is that now nobody would have genetic diseases.