Hi Yixi,
I agree with your point of view. My blog also wrote about the help of AR for education, and the video I was looking for was about this aspect. I also think AR is very helpful for interactive teaching. Compared with some pictures, students can see and learn some 3D models very clearly and intuitively. I think that if the popularity of AR can be increased, it will be a good help for both the teaching of the instructor and the learning of the students.