> The scientific, biological definition of gender is robust, consistent
and predictive.
And insufficient.
> Nobody in this discussion has offered anything to establish doubt that
the definition of two genders, reflecting millions of years of
self-perpetuating sexual dimorphism, is a meaningful, robust,
consistent and predictive one.
Sure they have. You've just claimed they don't matter.
I spent many of my formative years hangiing around New York and San Francisco in the mid-eighties, and thus to me the idea that the biological definition of gender is sufficient to talk about human behavior is self-evidently laughable.