With so many people, what naturally occurs is specialization. There’s a lot of work to do, and no one can master all the game’s systems. So, people specialize, there’s no way around it. It can be compared to an assembly line in a car factory. When people realize they’re just one very replaceable person on a massive production chain, you can imagine it impacts their motivation.
With specialization often comes tunnel-vision. When your expertise is limited to, let’s say, art, level design, performances or whatever, you’ll eventually convince yourself that it’s the most important thing in the game. People become biased towards their own expertise. It makes decision-making a lot more complicated. More often than not, it’s the loudest voice who wins… even if it doesn’t make much sense.