At the end of the day, what puts food on the table, what the customer wants. Even though numbers aren't the whole truth, they don't lie. Though it's fun to try to think up biological reasons and whatnot for the sake of imagination, in the end aesthetic appeal is a large selling point for the game in environment and models.
Case in point. Lalalalala - just snagged it from lodestone
Case in point. Lalalalala - just snagged it from lodestone