Wouldn't work for some of the races. The Au Ra, for instance, have a very distinct feature which is the men tower above the women. It would destroy the aesthetic of the race if they equalized the height of the two. The proportions would be ALL out of whack.

However, for the races that don't have a large difference like the Au Ra, they could make it so that the tallest female option would be taller than the shortest or average male. That makes sense.