So I recently stumbled upon an article that talks about why large teams have more trouble. The key idea he presents is "lines of communication". He shows the relation between team size and number of communication lines, then gives a few specific numbers. 10 lines for a 5 person team, 45 for a 10 person team, 190 for a 20 person team, and a whopping 4,950 for a 100 person team. This really illustrates how much the communication overhead takes over everything else as the group size increases.
The article can be found here
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