Yeah, I think if you are the choir, this is just going to be preaching. But, if you're an inexperienced developer and lean towards adding layers of abstraction, this might be useful. In fact, I just recommended this to a team of 2 developers to watch and they found it quite valuable. They are experienced developers, but one of them leans strictly to procedural code, and the other leans toward object oriented, and they were struggling. This worked as a conversation point to talk about where it was appropriate to lean OO.