This, this, a thousand times this.

Life is about evaluating risk. You need to learn it at some point. A playground is as good a place as any.

By all means, make them safe enough that kids won't get maimed or killed - but keeping kids from ever falling far enough to feel any real pain is probably counter- productive in the long term.

Sigh. My eldest kid's kindergarten advertised themselves as an outdoor experience thingy, then proceeded to cut down every tree on their premises as kids climbed them (the horrors!) and occasionally fell down (Aaaieee!) - so better make the playground look like any generic McPlayground.