The same things wrong with a wealthy person doing so. There is much more than is on exams. Exams are easy to pass, experience is hard to fake. Much, much more is covered than exams cover. That stuff is also important.
And more intermittent. They cover things in medical school that are important (and tested for in class) that don't make their way to the final examination. Those are things a medical doctor should know.
There are also labs that cover things that aren't going to be on the tests. There are practical examinations along the way. It's a whole big process and fairly standardized for a reason. It's not like many other disciplines. I got to witness my daughter go through it.
As much as love her and think she's the most brilliant person ever, she needed the full educational experience and would benefit from more. In fact, many medical doctors keep adding to their education.
I think a lot of us here are engineers who came from unrelated disciplines, or some even with no formal education at all beyond HS.
Other fields could be the same way, if they could get over the cultural and authoritarian bureaucracies. Architecture has less scientific foundations, but it's nearly impossible to do without the prestige of an academic institution.
Medicine is one of the most difficult fields, but I still think if you can demonstrate the same ability, you should be able to go to a residency program.
Academia has an unfair grip on modern credentials, and I think that is one of the great things about tech. For example, some of the very most brilliant modern innovators abandoned academia, Musk, Gates and Newell come to mind.
