I think the bigger issue is that many just don't care. Academia is structured such that the metric for success as a professor is measured by your academic rese

I think the bigger issue is that many just don't care. Academia is structured such that the metric for success as a professor is measured by your academic research, not your teaching skills. You gain tenure by producing quality research...while only requiring a pulse in the classroom. Many professors don't care, and those that do care often have had zero training about how to actually teach. It is a skill that has to be learned, few people are naturally gifted at teaching difficult concepts to other people.