considering how EX was a free burst in the first game, now you still get to use a burst, but you lose the ability to smash your opponent in EX mode afterwards, and have to do all that work again for an EX bar. To compensate, you get to get a few good hits in on your opponent and maybe an HP attack for some free damage to compensate for loseing your EX bar. It's just anouther part of the game that to me adds some much needed depth to the core gameplay. It makes EX a much more flexible tool than just burst -> combo -> finnisher, which makes it both that much more dangerous and that much more risky.