Given the value of all possible viewpoints, that the expected value of "a different viewpoint" is 80 IQ points (i.e. moronic) is probably wildly optimistic. Most viewpoints aren't helpful.
You indeed can't average a bunch of viewpoints and get anything good out of it. That's why Alan Kay usually has that vector space example where "different viewpoint" means giving yourself a vector out of the existing "plane of viewpoints".