Because once a large team is set in motion it can't make fast course corrections. It is rare that a project starts with the right idea. You have to make frequ

Because once a large team is set in motion it can't make fast course corrections. It is rare that a project starts with the right idea. You have to make frequent course corrections as you progress and discover things along the way. Without course correction, the large team builds the original idea, which is often not the right idea.