In my experience this is likely one half of a principle in which there are at least as many examples of people who can do things really well, but have no idea h

In my experience this is likely one half of a principle in which there are at least as many examples of people who can do things really well, but have no idea how to pedagogically transmit the building blocks of their domain understanding to others in a tractionable way. Maybe a more wholistic take on this is something like: 'Those that can't do, teach, and those that can't teach would really be doing everyone a huge favor if they would just go do somewhere.' If this is a more complete take, it suggests to me that the master/apprentice paradigm existed for so long for a reason; masters have spent their lives specializing narrowly, not necessarily transmitting their understanding, thus the deconstruction of their expertise is only accessible via osmosis over time, because essentially they can't teach.