It is not that simple.
I for example have Thyrodid disease, and every single doctor I went, including "free" ones (paid with public money) and the most expensive ones (I tried paying a famous expensive guy that help celebrities), all of them failed on me a lot, to the point I am mostly self-treating, I go to the medic only as a "ritual" of sorts, but I read my own blood tests, and decide my own medication.
I tried with many of them, presenting research I found about it, and they all said it was bullshit, that researchers know nothing about medicine, that only experience matters, and so on...
Some told me that the wrong blood test numbers they use, are correct because the laboratory says so, and they just do what the lab says.
After hearing this multiple times, I decided to take my blood test papers, and read them carefully, and found they do quote their source for the numbers! It is there, written where the numbers came from.
Yet, when I went to read the source... the research paper I was trying to show the medics were there! So, the medics claim to follow the guidelines and the lab values, that in turn cite a bunch of research, yet the medics insist in using outdated values, and claiming the research is bullshit.
To be honest, I don't even understand what is going on, I met so many medics like that, that now I mostly refuse to go to medics and fix my health in the way I can, I now assume that medics are literally evil, since they intentionally lie to me, or are intentionally negligent and ignore the guidelines they claim to follow.
The few medics I trust, sometimes I go to them even when what I need from them is completely unrelated to their field (one medic that greatly helped me with my thyroid, was specialized in eye diseases, another one that helped me with vitamin D deficit, was an medic specialized in arthritis, and I don't even have arthrists, I went to that medic out of desperation after hearing good things about her...)