You overlook the fact that doctors are in the profession of attempting to sustain and prolong our lives hopefully through educating us to making better choices more aligned with how our bodies operate in the first place, so comparing them to auto mechanics may have relevance in terms of how a mechanic is attempting to help you prolong the usefulness of your car, but your car is not your LIFE. Stop waffling. The point was relevant in the first place, despite your denial.