Why don't women have the depth that men have? There are two roles, the provider and the caregiver. Someone has to figure out how to provide for the family, or the family will die. This is a great pressure that can require fortitude, creativity, assertiveness, logic and rationality, determination and composure. Someone needs to be available to care and nurture and have the babies, or the family will die. This, in addition to requiring more patience, empathy, understanding, benefits from being ignorant of the external challenges facing the family. The routine and simple childcare and housework simply must be done, so it is of great advantage if the caregiver is unencumbered by the complex challenges of life outside that.