"What I understand about this concept of why is that it functions exactly the same way as parenting or exercise or any of these things we claim to invest in."

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I haven't seen any claim that Piraha lacks recursion, that is, that there are a finite number of sentences or sentence frames. If that's so, it would mean that the speakers of this language aren't making use of a capacity that they surely have, a normal situation; plenty of people throughout history would drown if they fall into water.

— Noam Chomsky