The term highest purpose isn't to denigrate other purposes, but to prioritize such that it can be assessed whether one purpose is at odds with another. This just means that if a society is oriented to make it overly burdensome for women to be mothers it is a distorted and mis-prioritized society. On an individual level you may have other goals and you should pursue them.
Discussion
right. if we make it so women have to give up their whole lives to have kids, they won't. We have to make the logistics easier.