How about that quote? Is it true?
If you are a student, wouldn't it be important to you that your teacher have practical/professional experience doing what h/she is teaching?
While I was an acting and playwrighting student at Ensemble Studio Theater in New York City for two years, those who taught acting classes were professional actors who supplemented their income teaching. And they were good teachers. Teaching is a calling, no question about it. It is a gift. These actors were wonderful teaching artists. The same was true in working with several playwrights of the New York and national theater scene who were also good teachers.
I certainly have seen people teach a subject in a very academic way that they have no real experience in. That practice isn't limited to high school; community colleges and some other schools sport instructors in playwrighting or acting when the teacher in question has not done any real work in either subject.
Why complain about all this now?
Because I wanted to make a blog entry, that's why.