At the same time, you need some top-down direction. You can't just tell a team of thousands of engineers to go build something, and expect it all to have a uni

At the same time, you need some top-down direction. You can't just tell a team of thousands of engineers to go build something, and expect it all to have a unifying theme, and work well together. It works well for small teams, but breaks down pretty quickly as team size grows.