Even if that's the answer, it's so fucking stupid. They budget a show, right, so if they cut corners by having simple designs and cut corners by having everything barely move and cut corners by using puppet rigs or whatever, what the fuck do they spend the extra money on?
To add on to
@starborn427614 and
@Thiletonomics as they are both completely correct, the other element is that we are assuming they have the money in the first place.
Taking a bit of this from a /co/ thread and some YouTube videos, but 08 really destroyed the industry. The pipeline for content was that shows would get made, then toys would be drafted to sell to children. When 08 hit, the pipeline got cutoff as lower class Americans couldn't afford the consumerism that kept children's animation alive.
The wider industry needed to pivot to teens as they became the primary demographic with disposable income. Also, to answer another commonly asked question, teen girls were heftier consumers hence why so much of the entertainment industry pivoted to YA girl-slop.
A major issue however, was the immovable object of US industry that was firmly planted in 50-80s toy economics of Y7 content, with splits between male and female. Kid shows with older audiences, which became the growing base, were largely unsupported as they didn't adhere to guidelines of outdated boomernomics. Just ask yourself, when was the last time you saw a non-preschool show get a large sum of merchandise you could find in a Target or Walmart? You can see how this business model being un-evolving ended in current 2020s as tons of toy companies are now slashing jobs and falling apart, probably because they can't rely on manchildren buying Star Wars toys anymore.
Japan, by contrast, was far better about evolving their industry to cater to teens and young adults. Mock the waifu statues and pillows, but those things pay the bills needed to keep the industry around. Western animation has nothing of the sort even though the industry was showing progressive changes since the 90s.