There are a lot of people that teach. I want to illustrate two. I'll call one the "Confounding Genius" and the other "Mr. Elementary." (Or CG and ME respectively)
The CG is a teacher/professor who isn't all that organized. Regardless, s/he is a genius. Lectures are given orally and are hard to follow because they are so brilliant and full of insight, or in other words, have a high idea density. ME is a teacher who, on the other hand, has a low idea density. S/He makes up for it by using nice powerpoint slides and extricating every ounce of meaning from what s/he says.
Which one is better? Well, if a student is struggling, the latter is better. If a student is advanced or bored, the former is better. We might prefer that all our teachers gave elegant overhead/powerpoint slides to all that they do, but it simply isn't the case to find a teacher who does everything the best. Furthermore, it is contradictory to cover course material both slower and faster simultaneously.
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