> They have kids to carry on their legacy, not for the joy of having them

For anyone wanting their children to be a legacy of themselves, the (blatantly obvious) irony in the above is that the less time a parent spends with their child, the less actual legacy they're leaving of themselves. Having other people raise your children means the legacy being left is that of the nannies or tutors or grandparents or teachers or the child's friend's parents.

If they don't see who you are and how you conduct yourself, they won't be filling your shoes.

But reverse-ironically, they'll probably be just as absent for their children, so there's a little inevitable legacy that will be passed on.