Probably any point of view from Conrad S. worth our attention. What is good about this video is it triages the most important for riders to focus on. However, one must pay detail attention to the content, and use your brain to think very hard whether what it says is applicable to your horse and riding situation.
For example: A horse is stiff at the neck, likes to yank reins out of rider's hands. My horse has the same problem. I later found that my horse did that was becasue my seat and contact were the problem. In the video, it was not the rider's problem.