I look at it backwards: A few humans improves a project. But once you get to sufficient sizes, principal-agent problems dominate. What is good for a division and what is good for the company disagree. What is good for a developer that needs a big project for their promotion package is not what the company needs. A company with a headcount of 700 is more limber and better aligned than when it's 3,000 or 30,000. It's amazing how little alignment there ever is when you get to the 300k range.

AI, if anything, is amazing at collaborating. It's not perfectly aligned, but you sure can get it to tell you when your idea is unsound, all while having lessened principal-agent issues. Anything we can do to minimize the number of people that need to align towards a goal, the more effectively we can build, precisely due to the difficulties of marshalling large numbers of people. If a team of 4 can do the same as a team of 10, you should always pick the team of 4, even if they are more expensive put together than the 10.