For some projects, companies hire developers with about a year of experience. A team is usually enthusiastic, eager to work and gather new experiences, and works well to a certain point. Then the project becomes too complex and, most often, ends up only half-realized. To prevent the project from failing, companies hire a SWAT team - skilled people experienced in working with demanding projects.
When it comes to efficiently managing the interaction and coordination of multiple Scrum teams in an agile way, the traditional management approach falls short of its mark. Clearly, one needs an Agile framework for scaling Scrum effectively.