Overview
Event-driven architectures fail when events are designed as implementation signals rather than domain facts — "RecalculateUserScore" (imperative command) instead of "UserPurchaseCompleted" (domain fact). Imperative events create coupling between producer and consumer; the producer must know what the consumer does. Domain event design decouples them: the producer records what happened, consumers decide what to do about it, and new consumers can be added without changing the producer.
The Event-Driven Architecture Framework designs events as domain facts, selects the right broker for the delivery and ordering guarantees needed, and implements consumers that handle the realities of distributed messaging — at-least-once delivery and out-of-order arrival.