I agree, but the focus point is not only to learn Chipmunk, there are always tutorials and example about it, especially now that it's free.
The goal is to understand actual CCPhysics potential and limits against Chipmunk old syntax in the same tutos updated (where I can use more CCPhysic API's methods or less in an old code..), and I suppose CCPhysics will be bigger than Chipmunk v7 (for example with methods like bodyWithTexture or a complete CCD).
I've see this kind of pratics many times..I do not see where is the problem. This is only my point of view.
Anyway thanks for your time slembcke , I appreciate you work.