They dislike being associated with a "Gender" so we get "Body Type A and Body Type B"
It's one of the things that companies do to facilitate minorities. Alongside stuff like being able to use male voices on a female character or a female voice on a male character, as well as the option for either genital on either body type - Things for the trans players who want representation (Though I still find it curious, as I was under the impression that trans people simply identified as the other gender and want to be seen as their "True" gender, rather than identifying as a mix of both genders that is the reality of the imperfections of sex change procedures... But apparently that's not the case for everyone)
