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Jordan comments on It's not like anything to be a bat - Less Wrong
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True, assuming sentient life is common enough.
Not true. This is like saying that if you roll a million sided die and get 362,853 then the die must have been fixed because the chance of getting 362,853 is 1-in-a-million!
Were that appropriate, the same mechanism would also defeat the reasoning in this post. While I agree with your ultimate conclusion, using solely the anthropic principle and no additional information, I believe you are compelled to conclude extraterrestrial life does not exist.
I disagree. There is a natural category (sentience, reflectivity, etc.) that picks out humans over other Earthly animals and leads to a more-than-max-entropy prior for humans being more anthropically special*; this is not the case for either 362,853 or Earth.
* If you accept anthropic reasoning at all, that is. I'm sort of playing devil's advocate in this comment; this post mostly just pushes me further towards biting the bullet of UDT/collapsing epistemology to decision theory.