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That's actually a really good point that I didn't think of. I'm imagining how huge the development team for Grand Theft Auto V is -- pretty sure the credits are half an hour long. Everyone needs to have that collective vision which is delegated by the producer. Otherwise concepts won't be cohesive.
That's what the producers and designers are for :P. Designers usually work in a team to come up with a comprehensive gameplay, missions, etc. Then they pass those off to the producer who makes sure everyone is working correctly and efficiently. Larger games are insane when it comes to that. Which is why they are so needed. But in, say, a team of 5 people, it's easy to just unanimously agree what needs to be done.