1. All the listed movies are very old and are from a time when animation meant you had to draw the single frames for the whole movie. You don't have to nowadays, technology has evolved a lot and you don't see this recycling anymore.
2. Just because another big company did it doesn't make it any better. So what if Disney recycles animation, does that make this practice better? for example just because your friend is a smoker, does that make smoking a good thing for you and your body all of a sudden? No.
3. Recycling some animations where it makes sense and doesn't get dull is okay but the Sims 4 is taking the easy road with animations all the time. They are recycling way too many animations. Anything that goes so overboard isn't acceptable to me especially if you realize how many animations just for the "chat" interaction the Sims 2 had.
The whole point of a game like the sims is to try and make things interesting and differentiate between personalities of the individuals sims. Watching the same animation for every sim is reduntant and makes all the sims feel like the same person. That's not a good thing.