Problem is that not everybody is a visual learner. I agree with you substantially. In teaching this introduction, Jon Dorbolo found that a part of the class was bored. As they shifted from one perspective to another, he found that a different part of the course became bored. So it was not that there was a low achieving segment of the class.
Some students are faith based.
Some are skeptics. Some are egoists. In the end, he came up with a course based on 8 paths of material. Each path is working on the same meta level concepts. But each path is presented from the context and perspective of a particular philosophical point of view.