I hope that as time goes on we are increasingly able to see ourselves as all in this together, rather than in a zero-sum game between genders.
I think it's better to realize that we're not all in this together, and instead to sacrifice unearned personal power in order to help the less powerful simply because we think it's just, not because we think that it'll ultimately benefit us in an indirect way. There's no way to allow power to women without giving up power over women, so control of women's agency and options has to be zero-sum.
Without an idea of "we're all in this together" from what would I derive motivation towards the just? Or even a definition of justice?
(Just in case we're having some miscommunication around different readings of the phrase, where one describes an "is" and different "ought": I see the phrase "all in this together" to refer to our shared inescapable subjection to the consequences of society. Although I can envision a reading that takes it as some assertion we're all equivalently culpable for steering. Unless you really want to get into the semantics, I'll stop typing and leave it at the point I see the former definition used in the parent post.)