Hello. I don't make the time for active participation in this community, but I enjoy my read-only interaction with it.
I have a sense that the time commitment required for effectively participating in this community is relatively high, and I haven't discovered yet whether this time investment pays back.
I like you list of hypotheses as to why high status people may be effectively stupid. I think an interesting exercise is to turn the assumption around and find reasons why high status people are not effectively stupid. Comparing between the two sets of hypotheses could reveal both structural issues to the problem and biases to your thinking.