Event-Driven Architecture (EDA) often gets touted as the magic bullet for loose coupling and limitless scale, but it can simply relocate bottlenecks and hide new forms of coupling in realtime interactions. Temporal coupling sneaks in at runtime, workflows spanning multiple services become a big design smell, and scalability at the system level might just pile up complexity elsewhere.
On top of that, event ordering and sensible service boundaries are absolutely critical to keep your system sane. By understanding the difference between design-time and runtime dependencies, and by carefully scoping your event streams, you can harness EDA’s benefits without trading one headache for another.
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