Thematically, I'd say Angular's dependency injection is "supposed" to be resolved by the tooling. If you look at Angular.dart, it doesn't have this particular hack because it uses the type system to resolve what to inject. But Javascript doesn't have static typing... "specify it twice (as a list of strings, and then a list of arguments)" is a fairly ugly and error-prone solution. Specify it once and let the tooling do the work seems like a reasonable idea.

I tend to find that most of the awkwardnesses I come across in Angular likewise come from the underlying nature of Javascript and HTML. As a concept, Angular.js seems to me to be fairly straightforward -- client-side compositing of templates against data (without imposing constraints on the type of data), plus routes and a promises library for http calls.