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2/ In the end, you need deep expertise in a domain to call BS. Otherwise you cannot reason by first principles accurately — you are forced to reason by analogy to things you already know, and this is error prone.
Not always true. This is the argument that paleontologists used to "refute" the Alvarez's asteroid impact hypothesis for the dinosaur extinction. The Alvarez's were outsiders (indeed, Lluis was a physicist). But they were right.
Were they outsiders to the community, or outsiders with respect to the necessary knowledge? [Genuinely curious: this is a cool example -- thanks for posting.]
Total outsiders to the community. And not experts in what people thought was the relevant knowledge (it wasn't). I saw a talk on it, which was fascinating, by someone who'd written a book about it. But I never read the book.
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