a good use of CG would be something like princess mononoke, the kind of CG that looks good would actually make the production even more expensive but cheap CG will always look way worse than cheap 2d, CG anime is like trannies, no matter how much they try to mimick the real thing it will never really pass.
This is something Miyazaki copied the staters for. Im gonna sperg here cause this is my favourite kind of animation but there were couple things in the late 80s and 90s which contributed to the animation renaissance. Two of the most important things being advance in technology and mature storytelling. The mature storytelling part is a bit of a postmodernism type thing where the stories told and the storytelling involved heavily plagiarized concepts, ideas and at times even adapted classical literature, with all the fucked up shit which came with that literature like slavery, genocide, dictatorship, grief and regret, addiction all that. Something similar happened with the 40s disney golden age which also did some of the same shit. In Japan that meant heavy focus on existentialism, extreme gore, horror, rape and the like with a lot of references to the atomic bombing campaign. The technology part is more interesting cause by the late 80s computers became quite good at handling graphics, primitive graphics. So what the animators did was make environments and environmental effects in 3d and characters animated on paper in 2d to streamline the process, what Disney patented as deep canvas. So in Lion king the pride rock and the wildebeests were 3d, in Hercules a lot of the vehicles and architecture was 3d, in Tarzan the vines and trees were in 3d, in Mononoke the Boar and other stuff was 3d, in Jin Roh the armors were 3d, Patlabor mechs stuff like that. This had a really interesting effect hitting that perfect spot between realism and expression while still looking amazing. The 3d environments contributed to the realism aspect and the 2d characters contributed to the expressiveness and relatability aspects while in modern times we are going to either extreme with live action being extreme realism at the cost of expression and Calarts, 2d and 3d junk being extreme expression at the cost of skill and realism. And these animators were really well trained cause they could draw high framerate stuff, ones and twos, of highly detailed characters with complex 3 dimensional movement. WRT to Anime, especially 90s anime it had some really great innovations, particularly in character and visual design. Two of the prime reasons I completely despise modern anime other than subject matter and pandering is the absolute crap character design which has become very very streamlined and the color grading/lighting choices which is even worse. 90s character design in anime is admittedly unrealistic but the characters being well proportioned and having wacky hair, big eyes, expressions, hyperproportioned arms and stuff looked good looking at it, the kind of stuff you would see in Ninja Scroll, Voltage Fighter Gowcaizer, Evangelion, Gunsmith cats stuff like that. 90s Anime Color grading did this very unique thing which I really feel should be patented and sold as an art form, the three color system where every character and interactable object always had three colors for each surface representing three lightings, dark normal and bright. These colors were also distinctly separated and gave an almost comicbooky pop art feel to the animation which made it look fucking excellent, something American Anime type cartoons tried and Speedoru uses a ton. Modern anime suffers the most here as colors are very high saturation making everything unnecessarily bright looking, animators add stupid lens flare type things everywhere trying for that realism, all colors try to be gradients for some reason where theyre not distinctly separated cause "muh realism" and a lot of hideous shit like that. CG does nothing to solve any of this and will actively make things worse, people should just go back to the fucking 90s when people knew how to make things look good instead of chasing low investment high return nonsense.