> if a little piece of technology allows kids to roam farther unsupervised

I think we have a different definition of 'unsupervised'; I understand it to mean "no supervision/oversight" where I guess you mean "out of sight"?

Similarly, I'm not sure what you mean by "overparenting", and even if I did I don't know your situation so I wouldn't feel comfortable charging you with it. That said, if I were to put such a device on my kid I'd feel I was doing something wrong.