The CG placement (and therefore the pin distance) tells you something about the internal weight distribution and the core placement. If you want a certain ball reaction/layout, a long or short pin (and also top weight) can be a "better" basis for the ball driller to achieve the intended result. Additionally, due to USBC rules some static weight limits have to be observed - and the CG placement/pin distance can limit you in your plans or require additional adjustments (balance holes, deeper finger or thumb) which can be avoided with a proper ball choice. But it's already sophisticated stuff - a certain pin distance does not make a ball "better", rather more suitable for your plans.
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