Human performance depends on a number of factors. These factors form a chain and this chain is as strong as its weakest link. So yes, some genetic diseases are

Human performance depends on a number of factors. These factors form a chain and this chain is as strong as its weakest link. So yes, some genetic diseases are severe enough to undermine cognitive performance. But no, genes are not the weakest link for most people. We are still wasting most of the human potential we already have. There is no need to seek genetic improvements at this stage.