Both films are quite good. They are deep, meaningful explorations of the themes presented in their respective films.
Is your issue that they reuse existing characters and locations to do so? How would using new characters and locations improve things? Inside Out 2 builds upon themes from the first film and couldn't be made without the first.
Yes, Disney dominates animation. They've done so longer than anyone on HN has been alive, because most of their animated films are extremely good.
The sad state Hollywood finds itself in.