Plus let's be honest, RNs primarily work with doctors who give them dire t orders. In the field you have limited resources, just you and your partner much of the time and must make decisions quickly and on your OWN. .
A Paramedic is not an independent practitioner. Your protocols are orders from your medical director which is no different than what an RN operates by every day in a hospital. Anything not in your protocols you call your med control and/or transport to a hospital to a doctor. The Paramedic TAKES their patient to a doctor who is required to be present in an ED. A nurse in a hospital or long term care facility may not have a doctor present nor should they call a doctor for every little thing. You should as to see their standing orders sometime and be surprised about the decisions they do make. The higher the level of care they provide, the more decisions about initiation of therapy and titrations they are expected to make. Again, most of the decisions concern medications and procedures which are not normally found in the Paramedic's scope of practice.