God created the book of nature as well as the book of Scripture, the laws of nature as well as the laws of Scripture.
I think that as long as we live on God's good earth, sex will always be a meaningful category, a category with broad consequences far beyond one's fitness to be a wetnurse or a sperm donor.
The broad, meaningful --- and God-designed, blessed and beautiful --- consequences of male/female: that's what I'd like to see expanded on, celebrated, and implemented.
Interesting comment. I am about half way through Harvey Mansfield's book "Manliness" and I came upon his main thrust today, which is similar to yours. Instead of denying nature and insisting on gender neutrality (similar to anti-gravity in its concepts). His logic highlights the irrationality of the radical feminists strategy based on Nitzsche and Marx and offers a balance based on the gifts of men and women. That is how I interpret the scriptures when it says the two shall be as one. I am an engineer by training and I am constantly awed by God's creative abilities and efficiency of design. If He could have done it with one sex He would have. There must be a deeper reason and I think you are close to the answer.