Probably because I don't think it's an actual Atlus team title, Spike Chunsoft is behind it according to the opening. Atlus USA simply just translated it for American and European audiences.
That said I played the demo on the Vita; graphics, gameplay and music all seemed pretty solid to me. Felt like I was just playing Persona (3/4) to be honest, really looking forward to the full game. Voice acting work so far is solid, I'm not irritated with it like I was for parts of other localized titles. Might give the 3DS demo a try to look for differences, but I wouldn't count on it.