I found that plastic degrades over time. I still have the wooden "Little People" from my childhood, things like Barbies got kind of weird in texture esp if stored in hot places like attics. My folks saved a very nice, spendy plastic doll, kind of the American Girl of it's time. The plastic was so fragile that by the time my kids tried to play (pretty gently) the legs were ripping out of the hip sockets, etc. Also, the very nice clothes had oxidized and the materials had degraded. They were stored in an attic, carefully and there was an attic fan, but the temps still fluctuate a lot for plastic or rubber.
The safety standards for things like baby toys change so much, that helped me in passing stuff on to places like shelters, the children's room at the library, etc. so the "life" of the toys can be used up while they are still "good"/not too worn/popular, etc. Even things like the paint on wooden blocks or trains can have different safety standards. Dunno if that helps at all but that is my thinking.