Mistakes have been made in the past, certainly. But there's no reason why other studios can't learn from those mistakes and do better in the future. The success of movies like Crazy Rich Asians (another adaptation, this one of a novel) shows that Hollywood can make successful movies and get representation right. The same can be done of adaptations of anime. To say that they shouldn't adapt anime because some movies whitewash them negates the numerous possibilities that future studios, and future actors, have to bring these beloved franchises to the big screen.