Wow. This is powerful stuff. Much of it is applicable to US law but Part III, which is more general, is absolutely required reading:
This Article has shown how the conventional reading of constitutional sex equality jurisprudence as grounded in the biology of sex is wrong and harmful to the cause of transgender equality and to the cause of sex equality writ large. It has argued instead for a reading of constitutional sex equality based in sex as a subordinated social class that could unite the class of women and the class of men, whether cisgender or transgender, and considered how this understanding of sex would stand up to scrutiny.
The story I have told is mostly one of law. But the ends this Article seeks to achieve in reframing our understanding of sex cannot be attained through law alone. This must also be a political project. We have work to do to strive for broader acceptance of sex as a social class. Public approval of this new concept of sex will require a social movement whose goal is to promote solidarity between transgender women and cisgender women by emphasizing the social rather than the biological dimensions of sex. This movement could be forged through the shared interests of at least some strands of feminism and transfeminism: bringing an end to the sex binary — the division of the sexes into two classes — and the sex hierarchy — the superiority of masculine over feminine. Such a movement can seek to demonstrate how combatting discrimination against transgender women pushes back against limiting notions of femininity that constrain all women. Only when we recognize how the categories of male and female limit us all will we reach true sex equality.