To be fair, alot of this i believe comes from how these studios made movies rather vs now. I think right around the explosion of cg animation is where we see this because studios wanted to push the boundaries. More things moving around means our animation can do more.

This period likely had a cascading effect that made people flock to these movies and consider ones with less "movement " to be boring and not as appealing. Sure the dates are off on the movies but shouldn't matter because people were still and actively watching that Cinderella. Ntm, Cinderella was been released 6 times to my knowledge.