Putting 6 or 12 or 535 people in a room talking about the same thing does not make them smarter. Collectively, they are not the sum of all their intelligences put together.
In fact, when they disagree and jockey for position and power on that committee (board, council, congress) the quality of the intellectual output of its members diminishes quickly.
There is no “supermind”. There are only individuals with individual ideas, and differing measures of will to bring those ideas into reality.