Good point. I agree with you regarding the harmful effects of the incorrect (excessive) use of cell phones, tablets, social media, etc. However, I would find a ban ineffective (nothing is more appealing than circumventing bans—and honestly, we “old folks” probably wouldn't even notice). Learning how to use them wisely, classifying content, and evaluating it for what it is seems to me to be the golden path. As you say, children are capable of understanding if you take them seriously.