I mean it's hardly as if being a college professor is easy. Generally speaking, college professors are at the top of their field. Even professors at not elite universities are among the best in the world in their field. That level of expertise DOES matter for teaching advanced (and especially graduate) courses. At least in my experience, professors to put in a lot of effort to make truly difficult topics accessible to their students. (Although without a doubt there are programs where the instructors are bad and don't know what they are doing. This is generally the fault of the university administration pushing for a program to have underpaid lecturers without academic experience as a moneymaking venture.)

Now on the other hand, lecturing what is essentially a non-academic elective like Beto is doing, that is a joke.