It can be good for some things, and is more convenient to schedule (don't have to drive there, no risk of getting sick from other patients). Plus, there's a chance that in the future it could enable people in HCoL areas to get medical care from providers in LCoL areas, which would lower costs dramatically. I think for now the state-by-state cartel is still quite strong though.

But I agree that for some appointments it obviously doesn't work because you can't examine the patient or take vitals the same way/at all.