"some insurers/PBMs' formulary committees do have some interest in new scientific information relating to drugs they cover."
Well, I can tell you Catamaran, BCBS' PBM, doesn't give two shits. They told me today they don't allow appeals and completely shut down the conversation. Scumbags.
After relevant, scientific information has been supplied to the PBM/insurer and is in the complaint file, it could become hazardous for them to continue such misleading practices
Now we're talking about two distinct things - what you wrote infers complaints to insurers from patients who were told they had to take GL instead of V, whereas the original discussion was just about insurers covering V or not, and on what tier. You could make a good argument that V and GL aren't interchangeable, but who are you going to complain to, and what kind of authority do they have to force insurance behavior to change? Whether I like it or not, I still believe insurers, as commercial companies, have the right to cover or not cover whatever drug they please - customers will vote with their feet if they don't like those decisions - so legally, you can't force them to cover any specific drug.