I think you have a very valid question and I would be interested to hear what others have to say.
Personally, I think it just comes down to it being an effective teaching method for some students. People learn differently. Who’s to say why someone learns something audibly, while another learns it visually? I guess for some people it just makes it more relatable, understandable, memorable, real. By seeing it happen and, at the same exact time, hearing the explanation, maybe it just “clicks” better with some people. You may not have needed something like this in your journey. You may not have needed this teaching method to know what you are supposed to be thinking about at each point, what each moment represents, why we do certain things, or what emotions we should concentrate on at a certain point of the Mass. However, for some people, this particular experience may have drawn them closer to the Lord through the Eucharist than a classroom setting ever could.
I don’t know if that’s the answer, and I am not justifying it…I am only offering a potential explanation for why it may be more popular/effective than a classroom.