Many people don't consider the possibilities of how their children would be affected when choosing a partner. Instead of thinking about "How healthy, attractive, athletic, tall, intelligent, etc will my children be?" They have children together because they love their partner and have emotion connection to them and want offspring with them. I believe thinking about having children in this manner is not an "inferior way" of thinking about it, yet when not considering factors like the ones I've listed above, you're jeopardizing your offspring's traits and characteristics which could lead them to a worsened life compared to if you were to have children with somebody else. I believe that the best thing a mother/father can do for their children is finding a fit and adequate partner (that they still love of course) to reproduce with.