Probably those that require a combination of some high level cognitive processes, tacit knowledge, and physical actuation in uncontrolled environments. For exam

Probably those that require a combination of some high level cognitive processes, tacit knowledge, and physical actuation in uncontrolled environments. For example, plumbers probably aren't going to be replaced any soon. Surgeons too. But between surgeons and plumbers, the latter will take more time to be replaced, because a construction site is less of a controlled environment than a surgery room.