The number of people on a team or in a slack channel is inversely correlated to total impact
After some threshold, 50% of the people self organize into just being note takers, coordinators, and messengers. Another 30% only work on the easy, shiny, and minimally useful things. Leaving only 20% of people doing the real work but now spending half their time filtering through noise and chaos
The ideal team size for a product or initiative is usually 9 or less