My main observation with Blanchard is that, although he has studied everything, none of it is through the lens of a woman, feminist or otherwise. And it shows.
It's the Upside Down, really.
Blanchard et al were the ones to greenlight heterosexual XYs to surgically/medically transition. But now transactivism hates them because they've got what they needed and don't like the idea of sexologists going about suggesting that XY hetero transition has a sexual motive. Conversely, feminists now stick up for them because they suggest that XY hetero transition has a sexual motive, despite the fact that they were the ones who came up with the absurdly sexist concept of "living as a woman".
It's like the plot of a Black Mirror episode.