The traditional fairy tale trope involves a princess marrying a prince as a symbol of love and social status. By subverting this expectation and having the princess marry the stable boy, the author is suggesting that love is not bound by social conventions or class distinctions. True love can be found between two people of any background, as long as they are truly meant for each other. This theme challenges traditional notions of love and marriage, and suggests that love is more important than material possessions or social status.