I don't think it's a Final Fantasy game. It's heavily influenced by the series, yes. But then, so was Chrono Trigger, and it is definitely its own IP. Bravely Default may be closer to the series in some ways, but both games are their own entities. Games that knew what to take from Final Fantasy, and what direction to take their own, unique charms.

And I enjoy both games more than the actual Final Fantasy series, so I don't see anything wrong with them being their own thing.