This is an american worldview. I guess it’s because there are so many different people from all over the world living there, so they simplify it by lumping them all together in white, black and asian. It’s not like that in Europe at all.
How can you judge something by apperance, not knowing wht is inside. This worldview is dangerous. Plus the second point is also completly wrong. There are no exclusive Japanese features in any story. You have a bad understanding of media.
You dont like the characters based on design, but creators are certianly were passionate about the project. I get why many Japanese dont like it, but it is aimed towards a different audience sadly. It is aimed towards american kids/teenagers, but it can be enjoyed by many others, adults also.