You’re trivialising it by making it seem to be just about toilets. The issue goes to the heart of every element of feminism.
What if one of the women you referenced in an abusive relationship fled to a domestic violence shelter, or sought relief from a rape support group. But was constantly re traumatised by the presence of men there (which has happened (eg Brighton survivors network, Edinburgh rape crisis)).
What if there was no DV shelter to go to in the first place, because it had been defunded for not letting men in (eg Vancouver Rape Crisis et al).
What if the violent husband is tried and sentenced for DV, but during proceedings he says his anger is due to his rage around his gender identity and the judge lets him off because trans (this has happened), or he goes to a women’s prison and terrorises the women prisoners there (and they get punished for speaking out. (This has happened).
All if those scenarios I’ve mentioned have happened and we’ve haven’t even touched on topics such as women’s sport. Or the sterilisation of children through puberty blockers. Or people losing their jobs or university places for questioning it. Or nurses being suspended because they don’t want to undress in front of men.
It’s such a vast issue that affects so many of the things feminists are fighting for. Many of us have said how annoying it is to have to go back and spend so much time, money and energy fighting this through the courts when we could be doing other things, But “what is a woman” affects so many of the issues feminists care about, we really have no choice.