Why do you assume that progress only happens at the interface between generations? If that were the case, human beings would be at a huge disadvantage, given th

Why do you assume that progress only happens at the interface between generations? If that were the case, human beings would be at a huge disadvantage, given that we wait ~20 years or so before reproducing. The longer we wait before reproducing, the more intelligent the decision to reproduce will be -- which is what determines the genome of the resulting offspring.