Coming here to Less Wrong, I posted a little bit about that, but I was immediately struck in the "sequence rerun" by people talking about what a great utopia the gender-segregated "Failed Utopia 4-2" would be.

Did you use a Rawlsian veil of ignorance when judging it? From a totally selfish point of view, I would very, very, very much rather be myself in this world than myself in that scenario (given that, among plenty of other things, I dislike most people of my gender), but think of, say, starving African children or people with disabilities. I don't know much about what it feels like to be in such dire straits so I'm not confident that I'd rather be a randomly chosen person in Failed Utopia 4-2 than a randomly chosen person in the actual world, but the idea doesn't sound obviously absurd to me.