visual instruction was limited
...and still is. One of the biggest learning curves I had during my internships was how hard it was to actually effectively implement movies and videos into the class. As a student, I just thought my teacher was showing us a video so they didn't have to teach a full lesson, or so that they could grade papers. I thought the questions they asked were logical and just thought of on the spot.
I was at a different district working under a Social Studies teacher that always showed movies in their class. It was to the points that the kids didn't want to do it (even though the did not have to fill anything out). The other teachers were saying negative things about the head teacher and I was confused. Once I saw there was not much constructive activity to go along with the movie, I was worried about its effectiveness.
I taught an Immigration unit and showed a video of Ellis Island. I attempted to make Guided Notes for them to fill out. I thought listening to it in pieces would be best. Turns out I needed to have them watch it through once, and then replay the specific clips multiple times. Creating thought provoking questions students could answer after the video was also more difficult than I thought. All of this to say that it is actually not much easier to teach using videos because you need to make sure you are using them in moderation, with the appropriate activities, and in a way that engages students. There are so many factors that videos may not work in a classroom.