From what I've seen and think its lore supported, is that Roegadyn and Lalafell are not genetically compatible with any other species other than their own.
But, Hyur, Miqo'te, and Elezen are; so it'd suggest a similar ancestor. So, in reality, on three species exist and one is split into three (or four if Au Ra turn out to be genetically compatible).
But, Hyur, Miqo'te, and Elezen are; so it'd suggest a similar ancestor. So, in reality, on three species exist and one is split into three (or four if Au Ra turn out to be genetically compatible).
