Surgery is obviously to truest form of medicine. A surgeon can diagnose and fix a physical problem, often without even needing imaging. If I show up at the ED with an elevated WBC count and tenderness localizing to the lower right quadrant, a surgeon can take my appendix out and make me better using nothing but his brain, his hands, and a few basic surgical tools.
A few other subspecialists can perform real medicine. Invasive cards can do catheterizations. GI can do ERCP. Some neuro guys can do invasive vascular interventions. IR obviously can do a lot.
But what do IM generalists, FM, peds, etc. do that can be considered real medicine? As far as I can see, everything non-surgical and non-procedural could easily be done by PAs and nurses. Why does the dude who tells you that your sniffles are due to allergies and advises you to buy Claritin OTC need to have the same degree as the physician who can open you up, fix you, and put you back together?