You are correct as far as that goes. The issue is not all veterans know what is valid evidence. I recently did this for my own claims (Tinnitus and an increase for migraines). The result? Denial. Expected. Took it to a Higher Level Review, pointed out the appropriate CAVC cases and was granted both. How many veterans know to quote CAVC cases? Not a lot. So while you can quote 'policy', you will still need to point to the specific CAVC case, 38 CFR or 38 USC law on your specific claim in order to prevail. That can take a lot of research that many veterans are not willing to put the work into. Be careful when you state that the VBA cannot 'make you' go to a C&P exam. What evidence is the veteran submitting? DBQ? Nexus letter? Lay evidence? Is this evidence adequate? Lots of variables to be making such a blanket statement.