Pablo_Stafforini comments on What do professional philosophers believe, and why? - Less Wrong Discussion
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We actually see this across a lot of fields besides philosophy, and it's not LW-specific. For example, simply adding up a few simple scores does better than experts at predicting job performance.
It's been shown that expertise is only valuable in fields where there is a short enough and frequent enough feedback loop for a person to actually develop expertise -- and there is something coherent to develop the expertise in. Outside of such fields, experts are just blowhards with status.
Given the nature of the field, the prior expectation for philosophers having any genuine expertise at anything except impressing people, should be set quite low. (Much like we should expect expert short-term stock pickers to not be expert at anything besides being lucky.)
The finding that expertise is only valuable in fields where there is a sufficiently short and frequent feedback look plausibly explains why professional philosophers are no better than the general population at answering philosophical questions. However, it doesn't explain the observation that philosophical expertise seems to be negatively correlated with true philosophical beliefs, as opposed to merely uncorrelated. Why are philosophers of religion less likely to believe the truth about religion, moral philosophers less likely to believe the truth about morality, and metaphysicians less likely to believe the truth about reality, than their colleagues with different areas of expertise?
Edit: this post is mostly a duplicate of this one
I would guess that those particular fields look more interesting when you make the wrong assumptions to begin with. I mean, it's much less interesting to talk about God when you accept there is none. Or to talk about metaphysics, when you accept that the answer will most likely come from physics. (I don't know about morality.)