> I'm yet to find a physician (especially somebody trained at Harvard/Stanford/etc plus a couple fellowships) who is actively practicing, and who hasn't told me with intellectual honesty that 80% of the patients they see present with trivial cases which could have been handled by a resident or a midlevel.

There's almost no job where 80% of it couldn't be done by someone significantly junior. Especially when people are going to die if the person in the role can't handle the whole job, and there's no cost-effective way of presorting the work, it's not at all a sign of overtraining that 80%—or even 90%—of the work items could be done by someone far less skilled.