Things appear to be different in the UK. I went to a new playground (new as in weeks old) the other day. It has multiple metal slides, a sand pit, merry-go-rounds, towering wooden structures to climb on (perhaps 5+ metres), monkey bars, exposed concrete climbing wall/structure etc. Some photos here: https://www.brentcrosstown.co.uk/claremont-park-play
It was absolutely shocking to me how many times my insurance claim form for a snowboarding accident in USA asked if I really don’t plan on suing anyone. The insurance company tries very very hard to not be the one who pays up … now imagine someone who doesn’t have good insurance.
I imagine the chance of getting sued for every playground injury makes you design things differently.
In USA admiting it was your mistake can be financially ruinous. So people don’t.
There is something of a resurgence of WW-II ruins like inspired structures. Less of the rounded corners and more things that resemble ad-hoc structures that might be found in ruins. Not to say sharp objects but things that contain some adventure and discovery... be it having multiple levels (earthen or otherwise) safe simulacra of vehicles, climbing, jumping, etc.
the one removal I agree most with is metal slides --hot, hot... though Glen park playground installed metal slides for some reason and so does yerba buena.