Earlier quoted context omitted.
If you have small kids that like to play outside, you would likely have grass, not trees or something else that is more wild.
Ridiculous, kids love trees. But also, rats and therefore snakes love leaves, as does fire. If you live in the woods the kids will love it, but you still have to keep leaves away from the perimeter of the house.
Plenty of us did as children as recently as the 90s, and even at that point it was less common than previous generations. I wouldn't do it today either, but the reasons are societal and/or emotional rather than any high statistical danger.