I'm pretty sure that thing only really exists with humans IRL. So, they'd have to model that specifically for humans, that no one will play becasue they ruined them.
So, that's why.
Actually elves have quite a lot of gender fluidity going on, their chief god and I belive all their goods are male and female.
As I side not I did a research paper on the hemaproditic polar bears once, its not just humans irl
