This is also, somewhat amusingly, game mechanics-accurate, too. Mikoto is a "piercing"-type character in the game, which do bonus damage against "heavy" armour type. And basically all Decagrammaton raid bosses are "heavy" armour type, so it wouldn't be out-of-place for you to run Mikoto in a team against such bosses. It's also notable that she's actually decent against Chesed, one of said Decagrammaton bosses.
