I am in no way saying Arcane does not 'look good' to me or in any objective way, in fact, I really enjoy the over all look of the show. But I think it is a bit disingenuous to use Arcane to prop up the advancements in 3D animation compared to 2D.
Plenty of people liked it, but I think it’s more people getting used to the style than it actually being good. Most modern animators and many viewers grew up with bad 90’s CGI, worse the old guard of computer animators where making it.
Taking with some of these animators they still recognize quality, but it’s like their uncanny valley has moved.
I don't really buy the idea that animators grew up with bad animation and have somehow lower standards... in the case of the handful of pro animators I know, they're absolutely massive animation nerds and their taste extends far beyond what they grew up with.
Anyway as long as we are talking animation. I asked one of the Frozen animators why the faces looked so freaky and they basically said meh, needs to be distinct to sell toys. Serious props to their skills and the massive R&D involved but that right there was the core issue. Moana’s water does a lot of cool animations but looks vastly less “real” than the objectively worse CGI water tentacle in Abyss. Again same deal it’s aiming for a style.
Ok fine you say what about CGI in blockbuster movies, except the article again points out how fake they look for various reasons.
I think 3D animation is just starting to hit its stride. The Netflix series Arcane is really beautiful, Spider-Man: Into the Spiderverse was incredible, and I was even blown away by Hotel Transylvania 4, which I was ready to write-off as corny kids dreck, but the manic slap-stick stuff they did in it is outrageously good. This isn't even getting into the epic-budget Pixar stuff...
Also if Ghibili is your bar I'd say 99% of 2D animation isn't even on par.