The lack of ftm typology seems moreso due to the difference in sheer scale of mtf to ftm tranners when he was still publishing that research circa the ‘80s-‘90s. Plus for a guy studying sexual disorders, AGP has got to be quite intriguing. He’s
tweeted about autohomoeroticism as a distinctly ftm trait (think fujos who troon out) but actually denounces the idea of AAP (autoandrophilia) because he believes it works differently enough in ftms to not be analogous to the mtf AGP. I agree that he lacks modern context and that merely splitting troons into homo vs heterosexual and early vs rapid onset GD isn’t enough but who would even allow, let alone fund, the kind of research needed to update the typology besides autists on a fruit farm forum
Edit: looking at big name ftms vs mtfs a huge difference to me is that ftms are - kinda garden variety buffet of autism, masc women, homosexuality and/or homophobia, sjw self-hatred (often for being fat, white, or straight), and fujodom. Nothing particularly jumps to me there. Mtfs are far more fascinating imo because they span lonely incel autists with catboy grooming fetishes to fat men who get off to the idea of themselves as inflatable pool toys and exclusively fuck other feminized men while larping as a true and honest dyke - the sexual deviancy is way more amusing in mtfs versus ftms who tend to be more…sad, I guess? I can only read so many “Today I totally fucked my cis gf with my [2inch] T-dick and she loved it!! So happy to be a straight couple!” posts before it gets a bit more grim than funny. On the other hand it’ll never not be funny to see a misshapen blob of a man with an inverted dick make awful porn hammering a dildo into his amhole because he fancies himself a milf online.