If the documents that we rely on for this stuff were written properly then we wouldn't be having this discussion. The fact that so many people aren't exactly sure of what they're supposed to say, and many who are sure are wrong, is a good indicator that there is not adequate direction in the publications.
Where exactly does one go to find all of the radio phraseology and broadcast/reporting requirements in the AIP and Jepps? It's not all in one place. The classic example being the position report format which is tucked away in the met section of the Jepps. The MET section!