Earlier quoted context omitted.
In many HCOL cities, for many couples, SAHM isn't a financially feasible option. Also, as a full-time mom, you’ve given up autonomy to your husband (since he controls the finances). While women can leave the relationship whenever they want, their careers often suffer, and they can’t just pick up where they left off.
Women can leave and get alimony, child support, and often times greater custody of the kids. Men don’t want to take that risk, so many men opt out of marriage as well.
There is a significant financial gap between a divorced woman in her 50s with only five years of alimony remaining and a career woman in her 50s with a $400,000 401(k) balance.