In my day, the main problem teachers had was their attitude and not their knowledge.
The second major problem was lack of timely follow up to ensure the subject matter was learned.
“The second major problem was lack of timely follow up to ensure the subject matter was learned.”
In New York in the ‘60s, “timely follow up” was the NY Regents Exams. There was no wiggle room. Either you passed or you didn’t. (And God help you if you were sick that day, which resulted in a do-over — the class not the test. The reason I took Algebra I twice.) The very minute I started my exam in western NY, my cousin in Albany was starting his identical exam.
Our teachers’ attitudes were great then; they cared whether you succeeded or not.