> is it still riding on the decisions of the training data that came from humans like the ones who made Zootopia by hand crafting every element of it?

How could it not be? Even if AI spews out a bunch of stuff that humans end up tweaking this limits future human creative output to modifications of whatever AI has already been trained on. It can only lead to a homogenization of art as AI regurgitates past works over and over again, only to be further distilled as new models are trained on little else but it's own slop or variations on it.

What makes animation interesting are the creative decisions. Character design. Prop design. Background design. Story. The more companies choose to use AI instead of letting artists make those creative choices, the more derivative and less interesting animation will become.