That was a much trickier question.
"Over here." Koutarou noted, pointing to a spot closer to a Hollow, but still beneath where Li had drawn the Shinigami. "Following your line of thought, a Hollow is free from the shackles of instinct. However, it lacks a very precious thing, which is purpose." To the Vice-Captain, that was a very important thing. "We may be burdened with the task we have, but if we didn't have it at all, we would be no better than Hollows by merely indulging our whims. An Arrancar has the freedom of a Hollow but none of the sense of duty of a Shinigami, to anything or anyone, in addition to holding more power than Hollow or Plus. That is a dangerous combination."