Event Storming as a concept is nice. (i.e. Before building a system, talk with stake holders about relevant "business logic" events happens on the system) It helps with building a common language, and understanding about what's important to the product.
But now there are levels? Detailed Agendas are needed? Well, consultants have services to sell, gotta name things.
And the best things are things that sound important but that your competitors haven't offered, proving that your service is more comprehensive.