The argument around adoption seems to be -
There are both biological and legal parents ergo there are biological and legal women.
I don't agree the same logic applies to being a woman/female but even if I did mainstream trans activism won't admit that men with an identity are male.
They won't even admit that women and 'legal' women are different so why the fuck are they even making this argument?
We accept anyone can take on a parent identity and be thought of as one. No-one questions it you call your Aunt who raised you 'Mum'. Therefore any man can take on a woman identity and we should just accept that without question.
Again the first issue with this is nobody is expected to pretend Lucy's aunt is literally the woman who birthed her. I doubt any social workers would be hounded out of their profession if the aunt was referred to as an aunt by them, despite Lucy choosing to call her mum.
The second issue is that 'parent' is both a noun and a verb. To parent someone or something is an action as well as the word for the two people who created you. This is commonly understood english language.
If we apply the same reasoning as to why adoptive parents are parents (they also parent in the verb sense) to trans then the argument being made is that there is such a thing as 'womaning'.
That it is also a verb, an action that can be done by anyone. It moves it from being the name, the noun, for adult human females into something that can be achieved by any man who just tries hard enough at 'womaning' or follows a prescriptive list of 'womaning' actions.
The notion of something, an action, called 'womaning' can only lead to very sexist, misogynistic stereotypes of all women because those are the only things a man could hope to emulate.
He can't do the physiological stuff like puberty, periods, pregnancy, menopause. He can't just be a woman as women just are. All he can do is paint his nails, wear a skirt, insist he now cries at romcoms and demand that everyone lies to his face.