I generally agree. I think there are no great answers, but the expert they interviewed makes good points. The main point that resonates with me is the network effects: if everyone feels pressured to begin using tools because they feel like everyone else is on them, it's very difficult for any parent to constrain their kid's use.

Age prohibitions aren't very restrictive because they're difficult to enforce. They're basically just advice and a legal tool to go after the very most flagrant business targeting minors.

As for the positive effects: that's a great point. I want my kid to have access to explore cyberspace in the same way I want them to have access to explore our city and nearby wildlands. I want them to have as much freedom as possible while teaching them to recognize and avoid danger. I think in all these cases, exposure with supervision before gradually increasing unsupervised access to areas that have become familiar is the only strategy to achieve that that in aware of.