That's an interesting question. I'm not sure this is a satisfactory answer, but I think what we do isn't really enabled by superior intellect as much as it is by a focus on good process and introspection.

In other words it comes down to good management -- this is just my pet theory, but as a ruminating introvert, when I did live and work in the US I felt that I witnessed a lot of extroverts get promoted into positions of authority because they were popular, and proceed to make poor decisions.