I think a medical license is a total joke. Now instead of quacks peddling snake oil, we get extremely expensive quacks with diplomas peddling snake oil. My wife has back pain and we paid for a $1000 injection the doctor recommended that did nothing.
And I think people who make these kinds of ridiculous blanket statements are a joke.
The licensure is a government run monopoly, which always leads to higher prices and lower quality care.
The fact is good doctors will be good doctors regardless of licensure because they will put in the effort to learn what's needed to treat the patient. Bad doctors will be bad doctors, becaude their motive is money, and they won't care about patients welfare either way. In some ways a license gives a false sense of security.