Both of my parents are physicians (pathologists). What you're saying isn't true at all -- they do diagnostic medicine all the time. This is in every way scientific. At the moment they're both doing research, but previously my mother was in private practice.
The further up the specialization ladder you travel, the more scientist-like the doctors become until you reach the pinnacle where doctors at research hospitals are doing ground-breaking treatments and publishing the results.
The gulf between the average MD doing GP and this pinnacle is huge. Much larger than most people suspect.
I don't understand what you're trying to say. First, the average MD isn't a PCP with generalist training. In fact, a lot of PCPs now are IM specialists. In fact, when talking about PCPs, there are many cases when no generalists come into the equation at all -- kids should see pediatricians as their PCP.
