>there are historically cultures with more than 2 genders

Name one, I'm actually curious.

But I'm holding you only on that one, but I also welcome you to define the hardness/softness of such studies. I don't believe that's a real science, but if I am given strong evidence suggesting otherwise, I'm hedging my bets to it being one of the softest sciences around, like jello made out of the bare minimum amount of gelatin for it to hold together. Because unlike traditional soft and hard sciences, I do not see real life useful applications of it so far. So, my PTSD is caused by my failure to realize my ninth astral level genderfluidity? Whatever, as long as you can make the trees stop talking.

That sounds more like a extremely narrow, super-specific area of study in psychology and/or sociology.