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.
We absolutely need to be teaching kids how to put their phones down and pay attention. Just banning them is a shortcut - kids need to learn to resist the urge itself.