Why did Square call Final Fantasy XV that rather than, to borrow from Momiji, [INSERT NEW SQUARE ENIX IP HERE: BRO SKYRIM EDITION]? Brand recognition based on the success of previous entries in the series leading to greater commercial success. If you want to use that to drive sales of and interest in your game, you also have to accept the consequence of being held up against the previous games. Or rather, live by the sword, die by the sword.