Even if you don't use the notes afterward, they are still useful. Video is a very useful method, but then the video has to be edited, or do you get three simultaneous streams, one of the professor, the board and the powerpoint? Videos like on Udemy are made for the medium. Class is not made for video, and I wonder how productive those videos are.
And when you go to class, do you really go home and see the whole class on video once again? That's way too time consuming. The notes are a good summary, much faster. Yes and it is taking effort, exactly what is needed. It puts your mind to work.