I like to think about this in terms of levels of abstraction. People deep in a specific domain master its details, but those operating at higher levels need to understand how that work fits into the bigger picture. That’s where mediators come in. They're necessary to bridge the gap between specialists focused on implementation and leaders orchestrating many projects toward a shared vision.

Incidentally, you see the same dynamic in software development. When you assemble libraries into a project, you interact with their APIs which are the interface that defines what the library does, not how it works under the hood. Management, in this sense, functions like that API layer where it surfaces the essential functionality of domain work while shielding higher-level goals from unnecessary complexity.

Ultimately, human cognition has limits making abstractions a necessity for large projects. They let us focus on what matters at each level without drowning in details we can’t possibly hold all at once.