@AdamRyan Thank you. I appreciate your re-reading and reconsidering.
My reference to "GC Ultras" describes people who believe there is nothing other than biological sex, people can't and shouldn't transition, there are men and women end of.
The thing is, I do think that. I am one of your "Ultras", and I don't like this position being painted as extreme.
At the same time I also believe trans people are mostly expressing something they genuinely feel.
But I don't think this makes them objectively any different to others of their own sex or any closer to others of the opposite sex, and I don't think the things each trans individual is genuinely feeling are necessarily very similar.
The awareness of the two sexes and the social gender constructs culture lays on top of them are so deeply embedded in human social experience that they are like a jutting out hook ready to catch pretty much any feeling of "not fitting". Whether that is feeling that one doesn't fit socially, emotionally, physically, intellectually, sexually and I'm sure 1M other drivers, that fundamental awareness of there being an Other type of human is there as a ready made metaphor to project your feeling of Otherness on to.
So I am against transitioning in the gender sense because I don't think imposing a subjective belief about ones own and the opposite sex out into the real world and on to real other people is a good solution. I think it forces the transitioner into an unstable (not mentally but socially) position where they are always expending mental effort to keep their constructed identity together against the reality of their true sex and history. And if there is medical transition as well then there is a whole addition layer of at best practical challenges and at worst ongoing physical issues to deal with.
I'd really love to see people accept themslves as their sex plus whatever separate, non sex/gender social identity resonates for them than legitimise the idea that (a) people can be socially or legally not of their sex, and (b) socially or legally closer to the opposite sex. The first because it's not true, and (like those medieval scholars) trying to fit the impossibility into the real work just creates more and more problems, and the second because it reifies the idea that there are mental traits that are "right" for each sex and if you don't have them you are in some way a flawed specimen of your sex.