@Jacut Long response as this addresses other comments sent to me.
CGI was in the 2000s horrible because it was the beginning. As at the time of Last Exile I didn't really see the problem, but when I rewatch the series a few years ago the 3D is really bad. Now it depends on the technical level of the CGI. I just finished Intial D and the 3D physics of the cars suits me very well in the last episodes. Demon Slayer and Fate Stay Night use CGI perfectly for the backgrounds of the fights. This results in an even crazier storyboard. Whereas the CGI in Fullmetal Panic last season is a sad joke. CGI isn't cheaper, but once you have your models it's a huge time saver. Finally on this question we see that Arcane and Spider Man Spider Verse have found a magnificent style between CGI and different digital/traditional techniques.
Most old fans of robot anime nevertheless hate CGI mecha : / Not bad in Gundam Unicorn but they took up a lot of time on each episode, we are at the level of a film.
Ai is inevitable but depending on the use the risk is the impoverishment of the diversity of the styles used. On the characters, the AI has already taken a big lead. Now when you go to the DeviantArt homepage 1) excess AI and 2) everything looks the same:
https://www.deviantart.com/. For the moment it's time saved but I doubt that the industry will not end up reducing its workforce while asking more of the animators who remain. Or simply keep the teams but overload the production schedules. The crunch isn't going to go away.
As it stands, it's not yet ready. In Kaiju there are huge problems with the proportions of buildings and certain objects, perspective, light and too many details that make no sense on several occasions (strangely very little in episode 2). The AI has great difficulty knowing how to place objects correctly, which causes elements to merge or overlap in absurd ways. The majority of spectators only look at the movement in the action, but as I am interested in the subject I always have an eye on the background, and my eye picks up if there is too much error. This creates an effect of unease.
But let's ask the question differently and I take up what Alexandre Astier, a French director and actor, says. Can AI write the perfect script? Create an art as sophisticated as the masters? He does not care. It doesn't interest him. What interests him is the human and why he came to develop this style, this technique, this way of directing or writing. The Hobbit is even more memorable when you know why Tolkien started writing it. The LOR when you know its background, its participation in the First World War, its culture.
I'm a fan of Makoto Shinkai and I love seeing the city through his eyes in his films. How he uses references to make the urban more poetic. Whether AI will one day do as well as its films at recreating cities does not interest me at all.