The pins are too dense/thick for all the water to go right around the inlet. The path of least resistance is fanning out so you don't get ~1LPM through a 5mm*2mm area, but rather 1LPM through 10 5mm*2mm areas. It's like doors and a crowd. The closest door is on the left, but 2/3 of the people are going there, so you'd naturally go to the door on the right, so everyone isn't crammed through together.
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