Procreation was designed to make us saints.

The accompanying tasks associated with procreation which includes education/formation of the children demand the most and best out of us, if we give in to God's will, and use all the grace He is ready to give us.

It's a gift from God.

Even the unitive serves the procreative.

These points from Church teaching are too big and beautiful for impatient people to grasp, so wedded they are to their own ideas and shrunken understanding of love and God.