The sex/gender distinction of the 20th century and now deeply popular among LGBT+ circles in the 21st century was one step forwards, two steps backwards. Although it provides a simple "explanation" of trans people, it ultimately cements sex and thus patriarchy as the natural state of things. Human sex has always been a social concept with biological justifications applied retroactively and selectively. The proletarianization of women and advances in medical science lay bare the absurdity of sex and for the first time in human history create the conditions for the world-historical abolition of sex and male supremacy. As the proletarian revolution self-abolishes the proletariat, so too does the transsexual-feminist social revolution self-abolish the woman and transsexual. Down with cisgenderism!
A friend of mine actually emailed the guy leading research on womb transplants and he said that nothing technically prevents trans women, but the surgery is currently a very dangerous one and they only allow applicants that have a higher chance of success (prior pregnancies, fairly healthy, can produce their own eggs, among other criteria). He said once the technology matures over the next decade or so and the kids currently born reach the end of early childhood development they would be more interested in expanding the criteria