I can see one potential concern from the perspective of a parent of a fifth-grader. If she has to watch three or four hours of videos every night in order to prepare for all of her next day's classes, there is no longer time for anything else related to being a kid. So no more piano or violin, no more karate, and she'll never see the softball field again. Not an issue if there is only one class using this model, but if they were all to adopt it then she'll have to devote all day every day just to get through sixth grade.
I can see one potential concern from the perspective of a parent of a fifth-grader. If she has to watch three or four hours of videos every night in order to prepare for all of her next day's classes, there is no longer time for anything else related to being a kid. So no more piano or violin, no more karate, and she'll never see the softball field again. Not an issue if there is only one class using this model, but if they were all to adopt it then she'll have to devote all day every day just to get through sixth grade.