I'm sorry but XII is anything but "huge, richly detailed". Nearly every zone is little more then a corridor attached to another corridor, and the detail is quite lacking as evidence by it not holding up as well as X did in the remaster. X remastered can pass as a current gen game in some scenes where as there is no mistaking XII is a ps2 game remastered.
It's fine to like a game, don't need to talk it up with hyperbole to say you like it. XII is not only far smaller in scope and world size then XV, it's also smaller in scope and world size then every pre ps2 FF game. It's not even close to an open world game, it's moderately more open then X and XIII but that isn't saying much at all.