@Datun
I agree it's regressive as a concept.
But, in reality, number three is rare, in my experience.
The behaviour displayed is stereotypically masculine, toxically so, not feminine.
Violating boundaries, not listening, self entitlement backed up with threats of violence.
True. Definitions I found online are not the same as observed behaviours, of course, and, yes, colonising and dominating behaviour seems not to be rare at all. The self-focus (lookatmeonly) is something I have certainly observed in groups, together with a lack of awareness of the existence of the rights of others and also an absence of empathy. It might be hard not to be that way in an obsession, of course.
What I really wanted to say is that if 'woman' is not defined on the basis of biological sex, then we really can't do anything much to support women's rights or to fight against sex-based oppression, because the alternatives either make it impossible to even define the affected group or define the group in such a manner that treating it as lesser really is not discriminatory at all.
When all genders can get pregnant, a gender identity approach in law could not be used to argue that discrimination has happened, and trying to redefine everything as problems about 'menstruators' or about 'birth-givers' or 'people who experience menopause' would turn the discrimination against one large group of people, the female sex, into lots of seemingly unrelated separate incidents. The intersectional nature of those would be disguised, i.e., that they all happen to roughly the same people over their lifetimes.