in not being very expressive it gives his guests too much opportunity to talk and that actually sometimes creates situations where the sort of people who come onto podcast, people who are self promoting, the sort who are always prepared with their talking points, to accidently slip up and start approaching something like honesty just by letting them keep talking and that makes him a better interviewer than the vast majority of people. he's good becuase he himself is kind of bland and interviews aren't supposed to be about the interviewer.
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