I agree it doesn't cover everything they do, but covering just some of the more routine activities can be enough for significant disruption. For example, dermatologists are fairly worried that "upload a photo and we'll diagnose your mole", either via software or outsourcing, will cut out a significant percentage of their business. It's not by any means the hardest work a dermatologist does, but it's common, steady work that produces reliable revenue, so it hurts to lose it. It may be that we won't need as many dermatologists only to handle the actually-hard stuff.

(Though for medicine in particular, I think a mixture of "you can always do more" and humans' seemingly infinite hypochondria means that medical spending will continue to eat up as much money as we're willing to throw at it.)