The current situation is political and ideological differences far more so than biological. Yes there are biological differences but very minor, they all have teh same lanky lean build, the same beauty focused appearance, same high intelligence and behaviourally and attitude wise they are also pretty much the same. What they choose to do and focus on is what varies - and is more based on school some focus on nature magic intesley, some on Elune, some on the Light, some on arcane magic, some on fel magic, some on forestry, hunting and tracking, some on fire magic, some on blood magic some on void magic .. You could merge them all into one and split them by school or profession instead - you wouldn't know the difference if it wasn't for their colouring.