TL;DR

Hexagonal, Clean and Onion architectures are just different drawings of the same idea: isolate your core logic from stuff that changes. They all exist to manage coupling, keep your domain stable and limit the “blast radius” when external bits evolve.

Forget the circles and layers debate—focus on the underlying principle of stability and clear boundaries. Whether you call it Hexagonal, Clean or Onion, you’re just applying one goal: decouple what changes from what shouldn’t.

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