Well, it depends on how you play the boss battles in the game. If you're dead-set on acquiring all of the really cool weapons and armor in the game, you'll have to devote Zidane to stealing continuously from every fucking boss. Doing that is not an easy task. You're giving up the strongest character in the party, and allowing the boss to survive for however long it takes, endangering your party altogether and making the battle a lot more difficult overall.