Obviously folks in this thread are on the more thoughtful and tech savvy side, but the overall problem is much bigger and it's not just about phones and school, it's about what these things are doing to our brains in general.
To me, the most disturbing part is how easily manipulated and lied to kids today are, look at the most popular influences, Andrew Tate, Jake & Logan Paul, mr. Beast, all of these assholes built literal empires by exploiting these mechanisms, and in some cases are using their influence to push these kids into different directions.
My sister works in school, she works with a kid with behavioral issues and the shit this kid tells her, the fucked up jokes and racist insanity that he spews from being in very weird, fringe communities is disturbing as fuck.
Trump won because his media apparatus was more in tune with this shit, he made huge strides with GenZ and Millennial men for the reasons that, in my opinion can be traced all the way back to Gamergate, the RW ghouls found a mechanism and started pushing buttons, it took a while for them to get good at it but they have mastered it now, and the whole US propaganda apparatus is now being employed in hyper charging this.