Honestly? Conformity is the rule and not the exception in animation since 2008.
Changes to the industry's management are to blame as far as I can tell. I'm not going to base it on the quality of New Tens media, only on the rationale behind it, and only in that it is very different from that of the era of ReBoot throught to The Fairly Oddparents.
The defining factor seems to be that other than industry vetetans like Faust, those involved on creating new works are not only a lineage leading back to the writers and artists for The Marvelous Misadventures of Flapjack - which on it's own is not enough to define the new era - but also that with rare exceptions the animation industry is not making animation for children but for all ages, which you would hope would be a good thing.
This sword cuts both ways; in film, animation for all ages has generally led to innovation and financial success, while on television - or later, streaming services - it more often than not led to creative stagnation and has even resulted in unprofitable works continuing while ones with great financial potential are abandoned (like how marketable Glitch Techs was compared to Infinity Train). The same seems to be true of anime.
Most importantly, current writers in many industries - most visibly in animation - are usually sticking to tropes like Draco in Leather Pants or Isekai in a formulaic manner rather than an explorative one.
If that doesn't qualify for a new age of animation then I understand, it's just that I'e more than noticed that most cartoons haven't felt well-written since Steven Universe became popular, and since that's subjective I'm instead trying to base it on the root cause of it all.
I get now that maybe I should have proposed that before trying to alter this entry. Feel free to make changes on the observations above or to dismiss it all. I don't really feel like this place is what I'm looking for in a trope wiki now that I've seen its limitations and that censorship is still in place if a work just so happens to be NSFW. I might not have use for porn, but being an asexual deprived of a way to find escapism for the past 6 years has made me realise that if I want ideas for how to subvert speculative fiction tropes in an era of trope wikis that ban content based on US law or Google ad revenue, I've literally had to deep dive into some places I've got no other business being in. Making a NSFW subpage for tropes would be fine, but ATT doesn't seem willing to do that so I don't plan on remaining here for long.