I definitely dont think its always safe to play outside all the time as kids, but the point is, that its also not safe in other ways to not go out.
Honestly, when i talk to some of my childhood friends, we practically had a feral childhood in the 80s. We had our run of the entire estate. In so many ways it was brilliant. We climbed, we made dens, we paddled, caught toads and fish, rode bikes, skated out we broke into abandoned buildings, building sites got into so much mischief, played bulldog with other kids from the area. It was honestly a charmed life in my memory.
Also broke bones, teeth, got into danger, got flashed by perverts. There was peer on peer sexual abuse, there was bullying, vandalism, accidents.
I didnt let mine play out alone as younger children, for various reasons, some of which i regret, but it just feels like different times. We dont live on an estate so hardly any kids play out, but i really think that the dangers of playing out are physical, but the internet generation are in danger in other ways