There are some seriously cool and dangerous looking playgrounds in Berlin. Many of them have ziplines, trampolines, and other long-since banned playthings. And I see kids on them almost every day.
As you say, stuff where you balance quite high up, but usually with a softer material on the ground than asphalt so that a fall isn't lethal. I never saw kids fall and hurt themselves, so I don't know what would happen if they fell from the maximum height, but they wouldn't die.