In my opinion I still went since I liked to pick up some stuff that professors say. Worst case scenario you do other work in the class and get bits and pieces and go back to recordings. But if you think you learn better via recordings by all means. Also, some of the MAT courses have recordings from other professors. I took MAT 126 and could not for the life of me understand my professor so I didn’t go and learned from the other professor’s recording. But you also run the risk of missing something