I agree that combos on Ifrit are bad. Other mobs such as NMs are highly suceptible to combos and will be able to be brought down quickly. So I'm in favor of it. In fact, I'm in favor of multiple ways to fight. I would like to see not only combos but group limit breaks = Riot blade + Chaos Thrust + Storms Path + all at 3000 TP = Massive damage. It would be similar to Battle Regimens, with the exception that you wouldn't need any other indicator except maybe a blinking TP bar to show that a group limit break is available.

Having multiple ways to fight, whether it be Combos, Strike and Evade, battle regimens, makes the game more interesting and let's the devs have fun thinking of wonderful ways to kill us off and give us victory.