The :app module needs to know all modules,

the multi module structure in my example, is used features aparted from :app module, you can see the advantages here https://proandroiddev.com/modularization-of-android-applications-in-2021-a79a590d5e5b .

Think about an app with 70 features + monolithic, this is a chaos.

I used a simple example how to resolve a problem with navigation on modules that dont know each other(without any dependecy betwen then).