I have so many questions about how this works in practice...
Are adults of female body who don't exhibit said typical behaviours not women?
Is there a cutoff, or is just one of the (undefined) behaviours enough?
Are there typical behaviours that indicate whether an infant is a boy or a girl, or are all infants non-binary until their behaviours kick in?
How about unconscious people of female body? There's a whole porn genre about having sex with them - are the men (presumably men anyway, based on their behaviours) experiencing pansexual attraction until the body wakes up and displays woman behaviour, at which point the man's sexuality collapses into straightness? Or can ones sexuality detect the implicit gender of a partner even though the behaviours aren't currently being exhibited?
Actually, same question applies outside porn as well - if someone isn't at that point in time displaying a gender-defining behaviour, are they in a state of agenderness? If not, what determines their gender for others during these periods of non-display?
Do drag artists become women for the period of their act, or is drag itself a man-behaviour? If the latter, how does one differentiate between a man performing the manly behaviour of exhibiting women's behaviours as a act and an actual woman of male body exhibiting her natural woman's behaviours?
And of course, and oldie but still a classic: given that physical sex differences clearly exist independently of gender-defining behaviours, are generally at least as easily recognised as gender-defining behaviours and manifestly have both physical and social consequences, why exactly does it make sense to take the pre-existing words for the two sexes ("men" and "women") and appropriate the pre-existing sex-based rights and resources for this new idea of "defining people by their average behaviours" , thereby trying to make the new average behaviours idea work in boxes that frankly don't fit it, make no sense when lookedcat closely, and create bad outcomes especially for people of female body who no longer have protections based on their sex, rather than simply coining new language and determining new, well fitting support structures built to meet these gender-defining behaviour needs from the ground up?