Earlier quoted context omitted.
I kept my notes from college. They're pretty much useless today because there's no context. If I had had the foresight to bring along a cassette recorder, that would have been the context. But I didn't, and neither did anyone else. Of course, there's no way I could have afforded the large number of cassette tapes, either, so the point is moot. It's too bad all those lectures are lost to history.
I'd say it depends on the lecturer and how the lecture is held. Some read it specifically for the notes to be taken. And it is assumed that students would learn from these notes afterwards, which are much more concise compared to textbooks.
But reading the notes later would cause me to recollect what was said, and so the notes were very useful. Unfortunately, enough time has passed that I've forgotten what was said, and only have the notes.
It's like watching a sitcom with the sound turned off :-/