If there is any reason to believe that the cause and underlying issue is medical, pt would be treated medically. That goes for opiod suspicion with respiratory depression and for example seizures.
As I mentioned, trauma is not an illness (there are rare condition and syndromes that are the exception) there should always be a suspicion of an underlying medical. Especially if the presentation does not fit the mechanism of injury. No one should be a cookbook provider, each and every patient is different and so is each scenario. EMS always looks for clues they are like the eyes and ears of the ER and play detective in trying to put together the puzzle. The trauma team relies a lot on the information the first responders have.
The entire note that EMS should change what they are doing is wrong, EMS now days follow evidence based medicine, gone are the days they did stuff that made sense. Its all based on the data at hand. so when someone comes and makes the claim that he is someone with medical credentials yet undermines the entire system, shows who he really is NOT.