History, cultural background and "the purpose" of sound design.
I think there just might be a tendency to focus too much on either technique, application or student self-practice/self-development.
But from the perspective of culture and humanity, understanding what purpose sound design and art plays to people, seeing significant works of art and having discussions about their meaning, might just have much more significant impact on students than any of the pragmatic things and techniques that can "always be learned" and which, in the end, are mechanical. To get them to think about what they're really studying and dealing with in the grand scheme of things and why. And for them to possibly gain appreciation for sound design that's "(culturally) significant" through seeing the great works of the past that are recognized as significant in some way.