It's easy to say "anything that improves on what we have today is a welcome innovation" but the whole point of the article raises the question of whether these

It's easy to say "anything that improves on what we have today is a welcome innovation" but the whole point of the article raises the question of whether these videos are, in fact, an improvement. Bear in mind that anything you do in the classroom is connected with a cost (based on the finite resource of time) -- if you spend time doing something, you lose the ability to do something else.