When you dry hop with high amounts of hop pellets, you will lose beer as these pellets absorb liquid, hence less beer to drink. Using lupulin pellets reduces the amount of hops used in half, meaning you will have more beer to drink by comparison. The same thing applies to whirlpool. More wort will be transferred to the fermenter.
And there is also the aroma / flavour part of it and the lower amount of vegetal matter your wort and beer comes in contact with, which is safe to say will reduce the risk of getting vegetal flavours in the beer, etc.