Why?

The Event Storming process brings together a cross-functional group of experts into a single workshop in order to:

gain a better understanding of the business domain by visualizing and sorting key events in the system
discover points of contention in the business domain language and in the understanding of the system
discover business-driven pivotal events that are better suited (for supporting future business-driven changes) to become technical bounded contexts (for defining boundaries in a microservice/monolithic architecture)

Architecture and Engineering