Passing is extremely rare. I'm sure many thought they passed for a long time when women felt it was just a couple of extremely distressed gay men. They didn't, we let it go. We are not letting it go now.
Women who identify as men are not a risk to men in mens facilities. Nor are their tubes of thigh flesh a threat to women in the womens. I still think men should be allowed the dignity of single sex spaces, but I don't much care if those women use the mens or ladies.
How would you like us to check if some men have had their genitals removed or altered? Especially conserving how few do?
Why does it matter? If women want space without male incursion, why is the presence of a penis important? It's not just the risk of rape, you know.
While miscarrying, or having the keep the door open with a double buggy, or whatever, why can I not expect a space without males, bepenised or not? If my Muslim friend wishes to adjust her head covering without a man present, is she less deserving of what she considers a safe space than a man with non penis?
Do you think women are just men without a penis?
Wtf is birth gender? We are born and die as a sex which OBSERVED. Gender is a set of stereotypes we may or may not adhere to, and sex is observed. Bodies commit crimes, impregnate, are more or less vulnerable. Not gender identities. So we classify on sex, not feelings.
If you've just name changed, why don't you know the 'they just want to pee' argument is utter bilge?