Only issue is that kids going outside alone has become highly stigmatized in society to the point where doing so gets you jailed and charged[0].
The kid will grow up to almost always be able to contact most any human in the world. Knowing how and when to do that is probably going to be a more useful skill.
0: https://imprintnews.org/top-stories/is-it-a-crime-to-let-you...
Side note: As above article states, after this arrest SB110 was passed to specifically outline what is reasonable for this situation.
> has become highly stigmatized in society
When making claims like this, please remember that this is a very international group of people and scope your point appropriately: "has become highly stigmatized in the US"
This is not a problem in large parts of Europe (can't comment about elsewhere). The reason this scoping is important is because the solutions are different for "this is a problem in all of society" compared to "this is a problem in the US".