Funny thing: This game is not XI. It just happens to be extremely extremely extremely close to it.

Not only that, but this world takes place in the world of Hydaelyn, not Vana'diel. Lore-wise it gives the world some originality to separate it from XI. And this games need more separation, not less. Just because you played XI doesn't mean that this game is XI. It's just a nice substitution.

However, anyone who says that the name changes would break the lore would be only half right. On one hand, one expansion can't just make an entire country - if not an entire world - of people change the way they call the other races. It's like one year passing and we don't call ourselves humans - we're Thag'oraki now. It doesn't make sense in a world and lore that is trying to take itself seriously even by a margin. On the other hand, we also have Materia from the world of VII, gunblades from the world of VIII, and a crystal tower from III, not to mention the name of the Garlean empire and the names of the classes.