Everything metal like slides, merry-go-rounds, etc. was made smaller, shorter, and made of plastic.
Even the shorter slides were turned into tunnels so that no one could fall off.
Swings were also shortened so you couldn't go as high and were made so that the most acrobatic kids couldn't go over the top.
Jungle gyms went completely away until rock climbing became a fad and now they have lame rock-climbing equivalents of the jungle gyms.
All of the school and public playground equipment here disappeared as a result of a big liability verdict for some kid who got injured. All the playground equipment got dug up within a year.