Well, since these ideas are not related to medicine, they cannot be its mistake. The level of pain does not necessarily correlate with the amount of organic damage and depends on a number of factors. Some tissues do not have pain receptors at all, some conditions can cause both an increase and a decrease in pain sensitivity.
Where did you get this idea from?
It is not, because there is no such postulate in medicine. But there is such a neurological disorder as, for example, hyperesthesia, characterized by an inadequate response of the body to external / internal stimuli, including pain, can increase many times, and this does not depend on the degree of organic damage. This is not to mention such things as individual sensitivity, pain threshold, and much more.