The traditional, Gradle-layout makes it IMO inefficient to navigate between files and is one of the (implicit) reasons why it’s hard for people to get onboarded and understand a project.
I need a good and simple entry point into the source code and having a layout which helps me to get the right mental representation of the project. In a multiplatform + multimodule project, it is even more the case and even after daily usage, you still feel the inefficiency of having a nested structure.
The Amper, flat layout, on the other hand, helps removing intermediary folders and clicks/typing and keep the files together which belong together (which will be even more the case when you can do it at the file-level, e.g. NetworkController@android.kt besides NetworkController@ios.kt).
All in one, thanks to the Amper layout, I would feel more confident to show the source code to new developers or even less technical people.