Thank you for bringing this up. Throughout college I have had this issue and one of my favorite things was when a professor would publish the audio recordings of lectures so that I could listen at 1.75x-2.5x and rewind in case I wanted to rethink something. I also really enjoyed that app where you have words changing at the same location at 600 wpm. I tried speed reading a normal book but I would always get way more tired than with this approach. I really wish they had multiple choices for learning instead of the same technique for past 10 000 years which is known not to work for everyone