Gender is about specialization, an evolutionary strategy that serves organisms well. Gender roles allow people to begin training and practicing in childhood for the challenges they will face later on. Specialization from childhood is not terribly important for the well-endowed, who are the ones with the wherewithal to publish about it. But for the large mass of humanity with average gifts, such specialization is essential to success. In a "post-gender" world, those people - and their kids - will be lost, which is why there is so much "irrational" resistance to the feminist project.