This seems a bit restricting.
I have been using @turboc’s trick of overriding the logging functions every since he came up with the idea. Which means just about all my modules are dependent on another module, which can not be defined as an app.
In this case, it doesn’t matter that much, because if I change the module I might as well restart AD, but the idea that ‘apps can only be dependent on other apps’ doesn’t seem right.