This is a wonderfull post/reply. Many thanks for that.
I'm now searching for words, as to why, the way yuo write certainly strikes a chord, but as I don't know you, I don't want to sound presumptuous, so apologies if I am too forward, but to me you represent a person who is a bridge builder and who can effectuated change. By describing different angles and views that matter and include genetics, biology, culture, as it is and as it can be, but in realism and in balance.
In the story you reacted on, I mentioned the 'axiom' from maths, the position one starts from and on which the rest is build. A rigid single facet axiom will rule out a lot of possibilities, people may pick it because it make there position and concerns more solid.
I remembered one more thing from the time when I studied, coming from Philosophy: What is true, what is ethical, and social philosophy, e.g. human rights.
On what is real, one can take two oppsing points of view. Reality is outside of us, and by our senses limitations we cannot perceive it completely. Or as people we are creative, reality springs from our minds, but because of our limitations, we cannot fully form it.
In my work, I have to invent and create, so you can imagine a discussion between me and collegas, on "when does something exist" ? For me from the moment I imagine it, it will only take a bit of time until I have made it. For my colleague, only after I have made it. Just to show that I personally am very positively biased towards the individual and prefer a sociaty where people can bring what they have to offer, not reject them on what they have not.
The things you mentioned, are part of this process from the day humans started thinking and creating and trying to make sense of the world. The metaphores things in our religion, but also the roles and stereotypes we have created for ourselves. But as we learn more, are all the old ones still relevant, or can we change to adopt better ones. If not women would still be owned by men as in the roman society, and was maintained until a 100 years ago.
Also because of my work in a very much male environment, I take my strength based on who I am, more than 'the prizes' for every bit I did. And in this context I look at womanhood as something that is (must be) more than the biology of the body, but definetely including the biology of the mind.
So I am coming from an angle that transgender person can fit in there, without (for me) being required to be exactly this or that.
All the more supprising (to me) that, as you write, certain activest apparently write that sex does not matter. This is contradicting to what I write, because taking in all angles requitres, well taking in all angles, and very definetely not leaving out any concerns. And given society as it is, with the real problems it may have now, one has to recognize that and cast it in law in a way that works and expresses a balance
So I accept transgender as real, a need for recognition and supportive law, but also the reality that this requires a society where there is women's rights are protected and the belief that can be achieved without complete sex based seggragation, but separation where it is appropriate. And where law has some guards against abuse by bad actors. To accomplish this, there's no need to prove anything but that transgender people are just that: transgender people.