The issue still remains that with a check like this, who is to say what content need be age-restricted now lies with the state. They could (and will) restrict content and information that I think my kid should have access to, and it will be a bit all-or-nothing.
Provided the above, I'd say the centralizing of information is the chief concern @SnotFlickerman@lemmy.blahaj.zone.
I don't know what a satisfying and achievable solution looks like here with that considered.
This is the biggest thing, in my opinion. Decentralization is a double-edged sword.
If I cared about my Lemmy usage more, I might be inclined to build myself a service that aggregates similar topics into larger groups.