The title is mostly true! Back in the day, there were no national or even state-wide requirements for what a doctor had to know. So many were barely literate, learning their profession like apprentices more than students. When, in the 1870s, the new Harvard president wanted to have written exams before MDs were given their degrees, the faculty at Harvard protested!
Professor of Surgery Henry Bigelow, the most powerful faculty member, protested to the Harvard Board of Overseers, “[Eliot] actually proposes to have written examinations for the degree of doctor of medicine. I had to tell him that he knew nothing about the quality of the Harvard medical students. More than half of them can barely write. Of course they can’t pass written examinations… No medical school has thought it proper to risk large existing classes and large receipts by introducing more rigorous standards.”