I think we may still be talking past each other. I really do support that anyone who identifies as a woman is a woman, not just because sex isn't binary and gender is socialized, but because that is already the case: cis-women just have their beliefs validated by others more readily.

As someone who grew up with segregated spaces, I think perpetuating those spaces gives a momentary sense of empowerment but is ultimately harmful.

That said, I recognize that a lot of women, particularly older ones who grew up with a lot of trauma, are terrified into protecting those spaces because they don't see that binary socialization is already ending for the next generation.