I do think he is being a bit babied tbh. Not that I am being critical, as where you live etc is so important here. It is probably a bad idea to ask others really, as everyone will consider their area and none of that is relevant to you.
I live in a rural village, children roam in a small area at 10 and adults keep an eye. Not even just parents, all the adults would be contacting parents with any worry.
My son is 6, so he goes out alone and unsupervised only in the area I can watch from my window (a playground is there, so it is not like he has a patch if tarmac road). He thinks it unfair as most kids can roam the whole wee estate (made of one road, three streets off, maybe 60 houses in total.)
It is hard. I posted here and was basically told that unless I stand and watch, doing absolutely nothing else, I am a terrible parent, but then around here, I am weirdly strict.
Just do what you find works for you. If you are uncomfortable, it is not ok.