It never happened in my day. I guess, that there is a fear of litigation if some little darling falls and breaks a wrist.
At my junior school around 1948, one teacher impressed us by using skillfully using the slide we lads had created.
However times had changed by the time I had children (relatively late in life). On the school playground were hopscotch markings.
My son was acutely embarrassed when I joined in one morning. I never understood why he was upset. The other kids though it was quite funny.
Jack