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Humans do not need oil changes.Very simplistic to compare cars to humans.

Yes... but also very appropriate to compare automobile owners to humans. You may not have noticed, but they are quite similar. :D

Mechanics have to also deal with people who ask for quotes to fix problem X, but then when the customer brings in the car they also want service for problems Y and Z. They deal with it.

And if my knuckle-headed brother-in-law from Jersey can handle it, so can an MD.

And the auto mechanic charges for every problem , and does not have to write a huge note to justify payment. If you cannot pay, you dont get the service.. If your car needs more work than the allotted time, you have to get a rental car while it stays in the shop. When you see a patient in the exam room, they want all their questions and problems dealt with at the time of the visit.
Your brother in law from Jersey also does not have to carry a beeper in case the automobiles in the shop want him for something. If the automobile does not work, he does not get sued and lose his mechanic license.
You also do not need a doctorate to be an auto mechanic. A high school diploma will do.