i think that the factor determining which jobs get usurped by AI first isn't going to be based on the cognitive difficulty as much as it is about robotic difficulty and interaction with the physical world.

if you job consists of reading from a computer -> thinking -> entering things back into a computer, you're on the top of the list because you don't need to set up a bunch of new sensors and actuators. In other words… the easier it is to do your job remotely, the more likely it is you’ll get automated away