Tldr: it is necessary because social media amplified, or created, big social issues that are still unaddressed; it will pointless because it doesn’t fix the problem, only the symptom

Internet is a wild place, more so for teenagers which can get bullied very easily, develop self esteem issues (Instagram anyone) and whatnot.

For adults it is a wild place too, but adults generally are less gullible than teenagers.

In the end though banning a smartphone doesn’t address the problem but its consequences: smartphones for teenagers wouldn’t be a problem if social media weren’t a Pandora’s box of echo chambers, grooming and deception. This isn’t a teenager exclusive though, everyone suffers from it… and if you think it’s not that big of a deal, look at all the elections outside the US that have been dominated by a shitty, easy, rhetoric spread mainly through social media; for Instagram there is no justification, open it and you will see people whose body and face are so perfect that Da Vinci’s Gioconda looks like trash