> ...the excessive use of screens that kills focus and the desire to learn anything that doesn't move
Screens killing focus is clearly not backed by evidence. There may be other evidence that shows that when stratifying by percentile achievement, screen use places students at a percentile below where they would be otherwise. But it is clearly false that the use of screens kills focus and the desire to learn anything that doesn't move.
Killing focus is an absolute term. You don't have to compare against someone else to determine if focus was killed. If the kids have focus at the end, then it is not killed. And at best it could be slightly reduced.
e.g. If you have the hypothesis that mangoes are acutely toxic and kill people you don't have to sample a lot of people. You are claiming a strong effect size. If even 5 people eat mangoes and don't die then the answer is that they are not acutely toxic.