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[Xzen]

Xzen was talking about the game engine of XIII Versus. Some gameplay videos on youtube show it has a very dynamic, action-heavy combat. As XIV uses the same game engine, the same kind of combat should be technically possible in XIV.
ATB gauge, Stamina bar and stacking commands are elements of the combat interface, not of the game engine itself.

If it is the same game engine then the combat we see in Versus is doable but it would require a lot of work from the devs. But in the end I think it really would pay off and we would truly have some amazing and fun combat in an MMO.