Ultimately animation is built targeting a budget: From the oldest animes with massive animation reuse and very low fps to complicated things that mix 3d and 2d. It's all a multi-decade race to make anime people enjoy for a budget the studio will pay. Almost every animation project done today (barring, say, the failure of Blue Lock S2, or Uzumaki past ep1) is has more animation per episode than most series in the 90s. Something like Witch Hat Atelier looks competitive with Ghibli movies, but it comes in 12 episode seasons: So far more animation total!

It's precisely the competition, and the quest for more quality for the buck, that leads to more foreign animation, more AI, or more 3d models. If people were animating like the old days, with hand-drawn cels photographed in complex rigs, we'd not get the same actual amount of animation made, and it'd be worse, just because the cost per series would be so high very little animation would be funded, and it'd be just for smash hits with big worldwide audience potential, not, say, series about rakugo. We optimize for output, and it often meands outsourcing and higher level tooling, which will include AI in one form or another.

We are in tech here, we have to understand there's big advantages to this for consumers.