it's also literally not. most of us all start with some level of testosterone and estrogen inside our bodies. *of course* messing with those levels below the requisite accepted threshold for a binary transition is going to allow for different results. it does in humans without HRT.

honestly the lack of any kind of even basic scientific literacy in the cass review is unsettling, especially when it's supposed to be focused on reviewing the science. you don't to claim that trans women aren't biological women when you don't know what a single word inside that sentence means.