I think you overestimate the abilities and knowledge of doctors and nurses. Healing is an art not a science, and it will likely always be so. Bodies are not necessarily understandable, especially as the person can tell you lies, is forgetful, or does not speak your language or understand your version of English words, and you have to do this in sometimes small time windows. The idea of a 'good' doctor is not attainable for most patients, it is a 'good enough' doctor that we are aiming for. So, stress testing docs in the field is looked highly upon by many of the elder docs, they then know that they can depend upon that doc when called for. I know that is not something that a patient necessarily wants to have happen to them, but that is the truth. We live in a world of limited time, money, information, planning, etc, more so in a hospital than anywhere else. Life is risky and will always be so.