Nezha 2 had a budget of 80 million while Inside Out had a budget of 200 million. There are several other examples where Asian animations with a lower budget and with the same quality as American animations manage to achieve the same results or even be superior.
I cannot express enough how true this is. The key animators in a lot of Anime studios are overworked, but there are also “grunt farms” which handle the heavy work of filling in the animations. Even US (and really, everyone else) studios farm out a lot of work to these houses, who take the barebones stuff the main staff have assembled and turn it into a polished product.