I'm most familiar with pharmacy and psychology as examples, although I think there are probably many other fields as well, maybe diagnostic radiology for example. I'm also aware of research on surgical specialists in areas of the world where physicians are scarce, focused on relatively minor surgeries, showing that these procedures can be done with the same outcomes if the providers have the right training.

My guess is there is probably a way to encourage fields to come up with ideas that any given person out there outside the field wouldn't think of.