I am teaching a large class of undergraduates Organic Chemistry.
Contrary to how I learned the subject, I have discovered that many profs at many universities today (including mine) are slacking and using powerpoint presentations provided by the textbook publishers (or sometimes created by the prof). Indeed, those powerpoint slides will have better graphics than you can draw with chalk, but they are not simultaneous with your thoughts on the matter. In certain subjects, one of the core lessons is to learn the medium of expression, the symbolism of the subject. In Organic Chemistry that is the ability to draw a molecular structure accurately and rapidly.
Organic Chemistry requires a lot of abstraction, a major part of that is being able to write structures rapidly. This requires practice. On the test you have 10-20 questions, if you spend 5 minutes of that test learning to draw structures we have failed as teachers. Powerpoint is a crutch and a failure in teaching IMNSHO. By teaching with chalk, I can get my students to attend and learn how to draw structures rapidly, when they are faced with a question they do not understand they can spend their time thinking about the logic and the drawing will come natural since they have been taking notes since day one.
IMO when instructors provide class notes in advance, students suffer.
/end short essay