I was speaking from a capitalist economics perspective, not some fanciful altruistic one. Again, I never said we did the most good, just that we do the least easily replaceable good that every person within our developed society. We don't live in Africa. We have plumbing and democracy and sanitation and the like. All of the basic things that can kill us have been taken care of. But if you want to get all touchy-feely about it- physicians are important in our society because despite all of these advancements, you will almost certainly have hour life saved by a physician at some point- all of those advancements mean nothing if you die of colon cancer at 40, anaphylaxis at 15, or a heart attack due to hereditary hyperlipidemia at 35. If you think there's nothing special about that, fine. I choose to believe there is, because I've seen a whole lot of people die and a whole lot more live, and what many of those that went on to live did with their lives was incredible. Seeing some of our success stories walk back into the hospital as fully functional people again, or getting letters and visits by the kids that we took care in neonatal intensive care, many of whom were on the edge of viability (23-24 weeks) at birth... I dunno, you may view those things as not a big deal, but they're the whole reason I'm going down this long ass road. They're a very big deal to the people involved, and I've been I both the receiving end if life-saving care and in the providing team side, and there's little that is as rewarding or real.
As to foundations, my point want that they were all equal, or that the people doing it do not require training, but that people with those skills are widely available. Regardless, who cares? First off, many of us are focused on what sort of good we can do in our own society, not internationally. Americans aren't dying from lack of plumbing or vaccine availability. Second, we're not in this to do the most good humanly possible FFS, we're in it to do tangible good while meeting other personal goals that differ depending on the individual.