I'm going to side with #TeamDerivative, as
the character style is extremely similar to Miyazaki's character style even pre-Ghibli.
Saying that, it could be welcome to be derivative of such an iconic and great character style. If anyone is capable of doing the style justice for the duration of a feature film, it's former employees of Studio Ghibli.
If Matt Groening's art style was adapted by his former co-workers so that they could make their own unique show in the style of Simpsons / Futurama / Disenchantment, I think that would have the potential to be pretty good too.