How healthy is a child is usually not correlated to how easy the childbirth is I think. My mom had 2 extremely difficult childbirth but both me and my brother turned out completely fine. In ye old times these women would just die from childbirth, get a miscarriage or the newborn would die. If I was born in the early '900 I would have probably died because I was premature.
To a certain degree new medical technology is good to help deliveries that would otherwise been fatal for the mom or the child, or both.
But the example in the OP is literally fertilizing an egg with defective sperm, which is imo completely different than just making childbirth easier.