Much of what we think we know about cancer is simply wrong. And the standard treatments are medieval.
Much of what we know about damned near anything is wrong after we find the right answer.
Some of us have lived in the space of time where we get to see this dynamic in action, an accepted and respected medical treatment supplanted by something that really works, and looking back, it looks like quackery.
But it is almost never quackery. It is simply the desperation of trying to have some answer when nothing works, instead of no answer.
That is the history of medicine. Over and over. When we get to the point where we don’t have to slice open someone’s chest, but can instead issue commands to the body it understands and can repair itself, EVERYTHING we ever did is going to look medieval.