I have, and yes kids can get pretty messed up depending on how they land and what they can hit on the way down.
It’s certainly not an everyday thing, but it definitely happens.
Happened to my youngest brother growing up, resulted in an ER visit. Fortunately no broken bones or head trauma but did get some stitches out of it.
My guess it’s more about fear of liability than any safety consideration.
“First, kill all the lawyers...”