oh dear lord. "women's spaces" ... can someone name another "women's space" other than a restroom, locker room or changing room? I can't.
We say we're discussing this in the abstract, but we're not. We're talking about freakin' bathrooms.
So, since we are actually talking about public facilities, let's get real for a minute.
Why do I feel entitled to use the public facilities reserved for women when I am dressed as one?
My female presentation entitles me to it, the same as it does for anyone else presenting female. That is what these facilities are for, they are PUBLIC facilities for use of female members of the public. When I am out in public in girl mode, I am a woman in as much as that all the ways I am technically, biologically not a woman are nobody's damn business but mine.
A point I made recently in another thread, bears repeating. The social convention of having gender separated public facilities is to protect the user from the public, NOT to protect the public from the user. The pictogram on the door with the lady wearing a dress should mean nothing more than "if you look like a woman, this is the safest place for you to pee and you're welcome here".
indeed, that's all it did mean until recently and everyone was ok with that.