mages versus orcs

What exactly is the problem with killing an Orc in the late game? For example, if you play as Hafiz against Hagesh and have a Knowledge skill of 40, it gives you a mini-art that grants 40% initiative to all your troops. Goblins will move before Centaurs. And in general, the entire ATB scale will be in favor of the Academy. Attack with Goblins, Mages, and Titans on a single target. Hagesh's Centaurs move once, and then they will be blocked by Tumblers, with a mini-art that provides HP and defense.