Female Au Ra were not designed like that because of the lore lol. Whatever lore they wrote came after that design. S-E knew exactly what they were doing, as evidenced by the number of people who have swapped their female mi'qotes for au ra.

People who play this game love animu girls and that's never going to change. It makes S-E money so that's how they're gonna design the races. I personally would have preferred to see the in-game Au Ra be more similar to the concept art that was shown for them, but then they probably would not be as popular as they are.

(Please please give us Bangaa next time S-E)