Agree. I propose hypothesis here all the time and people will say "Show me the study that proves what you are saying!".

For instance. It maybe that the distracting quality of the phone is not the only thing providing better sleep and mood, but maybe it is the collective power of the EMF radiation that is disturbing the children's catecholamines.

https://www.sciencedirect.com/science/article/abs/pii/S13826...

Ok. Design the experiment to test your hypothesis, and then present its results. The truth of it will be in the data.

There is likely a way to test this hypothesis on human children in an ethical fashion.

I already designed the experiment. I cannot get funding.

Also:

https://onlinelibrary.wiley.com/doi/10.1155/2014/198609

"They examined the acute as well as chronic effects of EMF exposure and found a significant increase in adrenaline and noradrenaline levels after EMF exposure, following a drop, but the normal levels were not restored even at the end of the study (about one and a half year). They also observed significant diminution in dopamine levels."

Or even banning phones makes schools (where the experiment is probably being conducted) less transparent, allowing more freely to pressure subjects (intentionally or not) to ensure the "proper" result of the experiment.