It doesn't have anything to do with the rarity or specialness of the hood. The Seibon hood, to me, is expensive and I rather not mess it up. Just because it isn't rare doesn't mean it doesn't have value.
The purpose is to serve as a safety measure per the vendor's recommendation. I agree the aerocatch pins are clean, but there's a lot more detailed cutting involved and the main issue is the slant of the hood. The pins, installed on the engine frame, come straight up, but the locking mechanism, installed on the slanted hood, come at an angle. It's the possibility of screwing up the cut exposing more than needed and having misaligned hood pins.
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