We attribute structural inequality to a lot of things. But somehow, marriage always gets the slip. There are still places in the world where women are less safe within the institution of marriage—places where rape is illegal but marital rape is permissible, places where if women cannot prove virginity to a new husband, she can be killed.
Additionally, the leading cause of deaths for men between the ages of 20-49 in the U.K. is suicide—it is suspected that this is due to the fact that fact that state policies undervalue labor, a traditional male sphere. Men are experiencing a crisis of identity in which they feel both required to and unable to live the traditional man-as-breadwinner narrative.
And the United States isn't much better: Policy solutions to traditional gender issues like domestic violence, division of labor within a household, parental rights, and child care draw from the worldview that the best way to order society, despite its abysmal track record, is through man-woman couples. For example, people who have been domestically abusive can still keep parental rights—that's not great.