I personally think that responsible smartphone use should be learned and practiced, rather than outright banning them.
I think this shows that adults are terribly addicted to their devices and think if they can’t stop using them, children won’t either. They certainly can’t teach how to use phones responsibly if they can’t do it themselves. Unfortunately for children the result is an outright ban.
There are plenty of hours outside of classroom instruction in a day where kids can (and already do) build all the digital literacy they like, so I don’t really see how that’s a meaningful argument.