Because you can't order many of your own labs, and then insurance won't pay for them.
Really? Which ones?
> insurance won't pay for them
Non sequitur, replacing doctors with AI will not help you pay for the preposterous US healthcare system. Vote!
There are extremely short lists of labs you can order yourselves. Virtually all of them are not on those short lists?
PSA and troponin seem trivial to get. Did you look?