Someone commented on how I mused hat the three ponykinds seemed balanced in a fantasy RPG, and disagreed, arguing unicorns would be way overpowered. Well, the disagreement continues, because unicorn magic for most unicorns is cantrip-level
Mundane Utility. Twilight Sparkle can do powerful stuff because, still using genre terms, she is a wizard. Not all unicorns are. Notice that when Rarity, a non-wizard yet very talented unicorn, gets captured by orc-equivalents, she does indeed defeat them and take their stuff... by social manipulation. On a society scale, the fact that "all wizards are unicorns" might mean something, but not between characters: in old-fashioned D&D only humans could be druids, but that didnt make humans overpowered in an adventurer party. Besides, pegasi can FLY, which is usually considered a game breaker in these games.
Back to something more interesting: A show can combine slice of life comedy and magical warrior girl action -
Akazukin Chacha did, for instance - but I think it would seep over so that one part becomes more dominant - in the example I gave, a lot of the enemies, despite being rather despicable, are also rather ridiculous, for instance. They would have to strike a fine balance to do both.