Pixar is rendering very complex 3D scenes one frame at a time. They can go back to the scene and do whatever edits and animations they want. You can revisit the files and say change the colour of a car and that model would have the new look throughout the animation.
Ai stuff is just a drawing, a picture. You can’t pan around and look or shift the light and materials etc, It’s just a generated picture. Just like old Disney films are drawings, when one was done it is set in stone, you need to redo everything otherwise.
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