The US Medical Licensing Examination is mainly for medical students not "senior" physicians, and the pass rate is extremely high for U.S. M.D. medical school graduates, over 90%. https://en.wikipedia.org/wiki/United_States_Medical_Licensin...

In other words, it's not a standard job interview technique for doctors, it's a one-time requirement for licensing.

The other difference of course is that doctors are legally permitted to open up your guts with a knife, unlike Facebook engineers.