Sounds like pure common sense to me. Schools are implicitly responsible for the overall well-being of kids. Many schools ban smoking, sugary snacks/drinks, some dressing style (or non-dressing), makeup. Many parents would love to send their kids to schools without a phone, this will empower and support them.
But do we live in an age where parental and community authority are so diminished that parents need the power of the state to bolster their discipline of their kids? Maybe we cater to the kids too much in that case. My mother was never afraid of enforcing rules with me. Every kid in my life had a gameboy growing up. Except me. I complained and said everyone had one. I’m really grateful she didn’t just fold to me because I’m not addicted to video games and knowing my generally addictive personality, I would be if I had been playing games for hours since the age of 4.
I threw a tantrum. For sure. Many tantrums. I said abusive things that I’m ashamed of, because she wouldn’t buy me a gameboy. But dealing with childish outbursts is a part of parenting. We don’t fold to children just because they make our lives unpleasant. She was also under social pressure from my uncle (whose son had a gameboy). She ignored it.
My high school has a VPN that banned Facebook during school hours. We were sent to the principal’s for disrupting the class or playing with our phones. Must we involve the state in everything?
It’s also pure common sense not to cheat on your spouse, or let a young child have an iPad, or watch more than 3 hours of TV in a day. Or drink too much soda. Or not going to them gym. By this logic, we should outlaw these too? Why is our reaction to minor suboptimal behavior to involve the state? There are many intermediary steps to enforce such a thing before needing to do this.