It's only "insane" by myopic Western/American standards. Look at the martial arts of Japan (Judo, Jujitsu) where to earn a black belt--which is traditionally not the end of learning but merely symbolizes understanding of the basics--takes at least 10 years of dedicated study. Since martial arts began to be "Americanized" in the ~1980s, we now see black belts handed out to 8 year old children after a year or two of st…
It's insane because it covers a very narrow range of topics. We make people doctors after 8 years of study, only a few of which involve actual practice.
If you are, individuals who ultimately care for patients must complete college (4 years), medical school (>4 years), and a residency program (3+ years).
Thus, training to be a physician in the US would require at least 11 years, of which at least five (the last five) would involve extensive patient contact.