I don't even think it's just these women who should expect a right to a female space. I happen to have suffered sexual abuse, as have a huge number of women - but even if I hadn't, I just want to be able to relax in a female toilet, changing room, hospital ward etc. and know it's female-only.
Of course some males might "pass", of course some males might just march in. That doesn't mean the concept isn't worth preserving. Just like we don't get rid of burglary laws just because someone might be able to either break in or get in under false pretences.
The point is that it should be an accepted, respected division that is enforced by law. So if someone is male they can be asked to leave and if they don't it can be enforced - and that in itself would mean most males wouldn't try - as opposed to now where increasingly any males know there's nothing anyone can do if they want to say they're a woman, go in, expose themselves and do whatever they like.
I want proper female-only spaces not just because I don't want to deal with that happening, but also because if there are males in there - even well-behaved, kind, lovely feminine males - it's STILL about centring males, being wary of males and not being able to relax. Even just talking about female biological issues, which women do when with other women, is seen as exclusive and hurtful.
A male can never, ever know, by definition, what it's like to be a woman and have a space where the constant vigilance falls away and you are in the company of other women and can share that – our femaleness. I'm not talking about girlieness, nail polish and high heels, but being female.