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Well, mostly it's about conviction. Nen is basically your spirit, so by limiting it you show a strong conviction, and it becomes more powerful.
This doesn't just apply to Kurapica, although his conviction is stronger than most. Little things like Shizuku not being able to suck up living beings with her vacuum, or Franklin cutting off the tips of his fingers to shoot his bullets are also restrictions they place upon themselves to make themselves stronger. I mean, their powers didn't have to work like that, they just chose for them to.
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