I think that this is like wrapping a kid in bubble-wrap, though. And like, not in that "over-coddling" metaphorical sense, but much more literal - sure, the kid can't get scrapes if they fall off their bike, but the other kids are going to make fun of the kid wearing bubble wrap.

You don't necessarily want to give them an unrestricted mainline to the worst of the internet, but you don't want to overcorrect so hard that you're causing other problems.

As toxic as it is, as much as there's space for harms and bullying, or that the internet holds porn and violent content ... the internet and social media spaces are where a huge portion of kids social lives live, and barring them from participating in that will do one of two things - teach them to get sneaky in order to bypass the restriction, or force them into an 'outsider' role in their peer group. In the first, it's a lost cause and all you're doing is making it inconvenient without addressing the harms - and ensuring they can't talk to you about what comes from that space. In the latter, there are strong social and self-esteem costs associated with excluding your child from having a social life with other children - is it "better" for the parent to do the harm instead of the other children? Is it better for your relationship with that child, long-term, their trust in you, or your ability to support them?

The kid restricted to "dumb phone only, no internet, no apps" is the current generations' equivalent of that one kid that wasn't allowed to go to the park, or the mall, or hang out on the street - whatever any given past generation used as their youthful Third Place, where they could socialize and hang out separate from school and without adults actively supervising them. And it's never been great for the kid whose parents won't let them participate in the common social life that their peers have.

It's far more fruitful to give them age-appropriate education related to their use of and relationship with the internet and provide a controlled and supported introduction than it is to simply bar their access for several years. You're either stunting their social development in order to avoid harms to their social development (?!?!) or you're simply winding the proverbial rubber band tighter and tighter against an inevitable rebellion - at which point they're jumping in headlong without ever developing any sort of media literacy or social media savvy and never had a chance to build coping and resilience for whatever rabbit holes they're likely to fall into .