In the American plan, the justification for allowing technicians to extricate, assess and treat patients before hospitalization was, and is, that they are working under the close control of a physician (protocols and phone/radio contact).
Their mobile units and kits should not be stocked beyond their protocols' needs, but new and entertaining means of using them occur whenever a protocol seems not to be available.
Hence there is a safety valve in most protocols to go outside the protocols, but I'll bet you a wheat stem penny that before protocols are broached (except maybe frontier areas) you are going to need to talk to a doc. Someone who recognizes that need early, carries it out swiftly and promptly, then enacts it is to be lauded.
The Pareto Principle pertains. Protocols will cover 80% of what's happening. And 80% of what you will encounter will not be terribly challenging or dangerous. This is a great buffer (only have trouble in 4 percent), but it means some folks, base upon their track record, will take it to mean they are doctors. They will not know what they don't know until it breaks down; it might not happen (or it will happen but be denied or not recognized) during a career, but chances are it will eventually. Then luck tempered by some articles and maybe internet hearsay the practitioner has come across is what lies between a critical patient and death.
If people want to practice the profession of medicine they need to go to school for years and keep up with the changes in philosophy as well as the technic of helping people medically or surgically.