I think what could make the difference is the process of selection "what is important to me to compress". If you know something already you can skip writing it

I think what could make the difference is the process of selection "what is important to me to compress". If you know something already you can skip writing it. If you heard an interesting idea you should write it in a way you would understand it the easiest later. For me, not all notes taken by people on exactly the same course were as understandable, because everybody did some "reinterpretation/selection" - which for me could be a proof of some intricate processing. If you want to follow up later, well, I think that's a different use-case - not related to focusing on the topic (also important but in other circumstances)