Tweed
Professional Kobold
Human beings have this tendency of writing what they know, to create something truly alien that isn't simply absurdity for absurdity's sake is a difficult thing. A lot of human beings are also terrible liars in the fact that they claim to want something different, but cling to what is familiar. Why take all the effort to come up with something new, explain biology, culture, etc and then transfer that into actual game mechanics when it's so much easier to make blue-skinned aliens with big tits and call it a day? It sounds like an awful lot of work for a writer to undertake for a normie who isn't going to grasp it anyway.