I'm a mom, wife, software developer, homeschool teacher, business owner, and lifelong student. I do a lot of learning while I'm doing mindless tasks (like washing dishes or mowing the lawn), so having video with audio in addition to text is perfect for me. I can consume the text during focus times and get a head start on each topic by consuming the video and audio while I am knocking out the humdrum day-to-day. I will also listen to podcasts, watch video tutorials, etc while I am in "downtime" or hobby time, like crocheting, quilting, and painting. So courses that don't have video/audio are ones that I don't generally take. Even when I do enroll for those courses, I rarely complete them.