Every second doctor is a below average doctor. Some are outright idiots that just became doctors because their parents expected it of them. They somehow finished med school and now they sick at their job. Have you ever interacted with doctors? In a hospital rotation where you see a different one every week. And they all tell you entirely different things with absolute confidence of a prophet after looking at your file for 2 min and talking another 3?

Even good doctors have a real hard time convincing the bad doctors to do their job right. Never mind some random patient with a slightly less obvious diagnosis.

This is nothing like anti vax, because it is not implying a failing of medical science. It just states that enough doctors are bad enough at their job that user research is useful. To realize you need to go to a better doctor