Because virtually all the characters in the plot have a tremendous amount of interaction with each other. (SPOILER)Cecil stole Rosa, the girlfriend of Kain, who gets mind-controlled by Golbeza, who kills the girlfriend of Edward, who incited Tellah's wrath for stealing his daughter, and it goes on and on and on. All the characters have strong reasons to like or dislike one another; if any of the characters had been absent, the game would have changed significantly. Which is a big change from the other games, because let's face it, if Cait Sith or Umaro had been written out, all we'd lose is a couple of side quests.
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