Let me count the ways ... ; )
I'm not asking for a count. I'm asking for an explanation: Pick one way you think it's wrong, say what it is, and explain why you think it's wrong.
Though it might be easier to count the ways in which such uses were right, the fingers of one hand probably being way more than sufficient.
Here's some ways it's right: It's based on observable biological fact, it includes all mammals, and it doesn't admit any confusion or inconsistency when trying to apply policy decisions to prepubescent boys, post-menopausal women, or people asserting a trans-gender identity. It effectively ignores all equivocation about gender as a social construct, focusing instead on scientific fact.
So. What's wrong with it, in your opinion?
Do show me the dictionaries and biological journals which explicitly endorse that "development pathways" schlock.
Soooo what? If everyone was jumping off a cliff then would you follow them over it? Too many of us are less humans than lemmings ....
Sorry to present some of your points out of order, but this juxtaposition is just too funny to pass up.
In any case, I'm not appealing to authority here, even though I'm confident in my assessment. I don't need a dictionary to tell me it's a good definition. I've reasoned it out for myself. Even if everyone else on the world disagreed with me (something I have not seen any evidence for), I'd still be confident in my reasoning and my conclusion: The developmental pathways definition, rooted in observable biological fact, is a good definition to use.
It's incoherent and quite anti-scientific claptrap. It leads to any number of quite serious - if sometimes amusing - contradictions:
Describe one such contradiction, in your own words. I'll even give you an example to work with: A transwoman is convicted of a crime, and asks to be sex-segregated with the female prisoners. However, according to the developmental pathways definition of sex, she's on the male pathway, and therefore should be sex-segregated with the other males, regardless of her gender identity.
Meanwhile, a post-menopausal woman, also a convict, asks to be sex-segregated with the female prisoners. According to the same definition, she's on the female pathway, and therefore should be sex-segregated with the other females - and would be even without her asking.
No contradictions so far. Can you come up with one?
You may wish to take a closer look at my last comment; uses really aren't a guarantee of anything, much less of truth or falsity:
They're a guarantee of usage, though.
What's untrue or false about the developmental pathways definition? It's rooted in observed scientific fact, after all. Are you saying the underlying science is wrong? That a female who's had a hysterectomy is no longer on the female developmental path, as determined by her genetic heritage from the moment of conception?