If you're wired to update your beliefs in an irrationally small number of irrationally large jumps, making the jumps smaller may hurt you.
Let's say you get 10 pieces of info, each of which justifies an update of 1 bit.
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But let's say humans are wired to do nothing half the time and update 2 bits the other half the time.
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Then if you fix the bug where humans sometimes update too much, they'll update too little on average.
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And if you fix the bug where humans sometimes don't update at all, they'll update too much on average.
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Unless you fix both. Then everything is great.
End of conversation
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