[tompazourek]

I think it's a similar pattern, but at a different layer.

You can compose methods, compose classes/instances (DI), compose libraries/assemblies, compose processes, microservices, or entire apps and multi-app systems. There are similar patterns of composition, just each is at a different level of abstraction of the whole thing.

Sometimes it makes more sense to compose it inside an app, sometimes it makes more sense to design it differently and compose on another layer. Sometimes it can be both or it's blurry and not clear...