luna is a fave of mine. ableit i prefer her version shown later. lot of people complain about her demeanor and appearance there, but it makes sense. that form was probably becuase she was weak back then, her demeanor full of guilt because of her cruel actions. later, she got stronger and decided to continue her duty as a princess, unfortunately living on the moon made her method archaic.
now that i think about it, celestia probably did that herself. it would probab ly be hilarious to she shouting at her subjects while being theatric. probably when she realized she jsut scared the piss at them she realized she should quiet down.