I think the reason the Jack Pack turned out like they did was because genetic engineering had been driven underground and their parents had to go to "back-alley geneticists" much in the same way women have to go to back-alley abortion doctors in areas where abortions are illegal.
Also, for a society that claims tolerance and diversity, it seems grossly hypocritical for them to outlaw genetic engineering. Vulcans are thrice as strong as humans and live thrice as long but are Vulcans forbidden from procreating? Why can't humans be allowed to be as strong or live as long as Vulcans? Because it's natural for the Vulcans? If you had a chance to give your child the ability to compete with the Vulcans or other species who, by the genetic lottery that is evolution, ended up stronger or longer-lived or telepathic, would you not take it?
Also, for a society that claims tolerance and diversity, it seems grossly hypocritical for them to outlaw genetic engineering. Vulcans are thrice as strong as humans and live thrice as long but are Vulcans forbidden from procreating? Why can't humans be allowed to be as strong or live as long as Vulcans? Because it's natural for the Vulcans? If you had a chance to give your child the ability to compete with the Vulcans or other species who, by the genetic lottery that is evolution, ended up stronger or longer-lived or telepathic, would you not take it?