It is a strange comparison, though I don't think the "stringent process" is the issue and it's more just that they are entirely different fields with different ways of working with different kinds of feedback in the broader economy with different levels of observability. You might find that even the doctors that had years of study and paid supervised practice (residency) are unable to answer basic things. From an MD last year: "Even doctors forget the relationship between calcium and Vitamin D, and I have spoken with doctors who did not realize that 5000 units a day could cause problems. As a doctor, there is a lot to know and remember, and most doctors haven't studied calcium metabolism in many years." (https://news.ycombinator.com/item?id=24065115)