[@POOHEAD189]
Maybe my Kuru is acting up but this seems to make less sense the more you explain it. Let me recapitulate.

Even if it were only for the parents aesthetic benefit, I don't see any reason why they shouldn't tip the scale of random selection one way or the other. They are choosing to create a child, why not choose for it to have dark lustrous hair?

Why would randomness necessarily be better than design? You might end up with a girl anyway, why not put your thumb on the scale. Admittedly its not a great use of what would be amazing tech, but neither is 99% of what people do with tech.