There is some truth to this,,, but also some deception woven in (not intentionally on your part) with this theory. Because there is also some dilution within the group. All of us would be exponentially smarter than any one of us if it weren't for individuals who operate on a basis of conjecture and their own "reasoning" even in the face of facts or evidence contrary to their conjecture or reasoning. There are many who seem insistent on perpetuating muzzleloading myths amd legends regardless of evidence or new discovery.
Then when someone argues with these individuals, someone gets better hurt and leaves or starts sticking people in the ignore box.
This doesn't help the group's overall combined knowledge.