Well, the reason I asked for the service invoice snap shots is to make sure that we are not playing loose with the facts, all the while engaging in what is becoming a favorite pass-time of bashing Tesla without a justifiable reason.
I am not sure based on what you labeled installing improved windshield defroster vents as a "service bulletin". I happened to have the same done to my car, and my service invoice does not refer to this as a service bulletin - it is called a "Defrost Mesh Grille Update" - see snap shot included below. I would be interested to see how is this presented on your Service Invoice.
There is also a problem with the declaration "Tesla is not publishing service bulletins". The process of "publishing" TSBs includes their dissemination among the dealers that service manufacturer's cars. TSBs also are reported to NHTSA. Other than the above there is no procedure to "publish" TSBs. Since there are no independent dealers in the Tesla service model, their TSBs are disseminated among the Tesla Service Centers and reported to NHTSA. As can be seen from the above saying that Tesla is not publishing service bulletins, keeping them secret is a misnomer.
I would hold off with the sweeping declarations until evidence supporting it actually shows up.
It might be useful to read the following article explaining the process associated with TSBs and the difference between TSBs and service campaigns:
Recall, TSB or customer service campaign: Whats the difference? - Chicago Tribune