Well you know the old saying “Those who can, do. Those who can’t, teach”...
You stole my post! I always add this:
Those who can’t teach administrate.
I had a professor in college, in the business school. Every other professor in the school had some actual business experience. This guy had none. As I recall, he discussed a job sorting mail at the post office. Nothing else. Needless to say, he was a lousy business instructor.
I took my first two years at community college. The instructors there were better than at the university. They were part time teachers with full or part time jobs in their actual field.