many doctors are just really good at regurgitating information, they're not particularly inspired in their field of study or stay up-to-date on all the latest information. they just got into the work because it appeared to be a stable well-paying job, simple as

then are entire fields compromised by $ and short-sightedness, like podetry. modern feet have so many problems because modern shoes are just...terrible, but podiatrists make a bunch of $ peddling "arch support", special shoes/inserts etc.

the foot-arch comes from a muscle, muscles atrophy when you when support them...all you need to do to get arches back is wear flat-soled shoes (this hurts, if you've not worn them...ever, as those muscles have barely been used)