You're right until a certain level. It's true that Anima will be one of the most Useful typings, but (now the Anima fans will hate me) for some units a Breaker or a Guardian will still be better! For example: I prefer Breakers in Arena and Guardians for Healer. (except if it's a versatile healer like Eir). I think that a Healer should be able to go instantly to Full Health. So in those cases I'd prefer Breaker/Guardian.