If single sex spaces are impossible to achieve, why do we have them? Why have we been trying for decades?
I would say that the idea of spaces for women and trans identifying men are more difficult to justify, design and police.
For a start, are trans identifying women included? If so, why is their transition not as significant as male transition?
Then we have to justify why women, either including or excluding TM, and TW need space away from the majority of men.
It can't be for reasons leading from female sex, it can't be about VAWG because TW are just as likely as any other men to be perpetrators. Opportunities? Is there any evidence that all women and TW have the exact same barriers to the same opportunities?
Even if reasons are found, sex difference are still there. Safeguarding still exists and its just not safe to encourage adult TW (who are male) to be alone with girls and vulnerable women. So the design of these spaces will have to allow for that. Single sex with 'gendered' spaces.
Then it comes down to policing.
As a species we are good at identifying someone's sex. We are not good at identifying someone's gender.
No one, not a girl, women or TW could question any man.
So why are TW so keen to create these spaces? Its not about a shared need to avoid men, because the set up couldn't exclude men. Are we to have clinicians diagnosis people at the door?
TW inclusion is only for validation, isnt it? And if they cant use the women's spaces, they want to destroy them.