In short, Rule of Cool. Mecha animes do run on it alot more than others.
Oh, and I'm not quite sure how Cinderella comes. There are literally thousands of different versions of the tale, some which are Older than You Think. As for the glass slippers, it was explained that the slippers were the only thing which did not disappear. Cindy did have the other one with her, while the Prince pocketed the one left behind.
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