>Medical understanding is not getting worse, unless I’m severely mistaken.

You are mistaken. To realize that you will have to look back several decades and read the literature of those times, of what is left. Now note I'm taking about chronic illnesses (diabetes, cancer etc) not acute ones like an infection etc. The medical practitioner of yesteryear did not have the fancy diagnostic tools that we have today, but several of them appear to me to be sharp observers.