This issue was included in the spec as:
But it is more difficult than just implement one wrapper class. The reason is @ListenerFor and @ResourceDependency annotations could be used in the base class and in the wrapper.
In this part we need to update MyFaces implementation to check for RendererWrapper in the places where we need to scan for annotations.
I can remember some problems with renderer wrappers in extval and other libraries, and the inclusion of RendererWrapper aims to solve all these troubles, saying "all wrappers now must implement RendererWrapper class, and you can walkthrough the hierarchy of objects using getWrapped() method".