The original anime was better, but "cultural appropriation" is a largely American hand-wringing exercise. I saw videos of Japanese people interviewed on the streets of Tokyo who were honoured that the film was being remade by America, and by someone as talented as Johansson. It works both ways too, by the way - Clint Eastwood's classic Unforgiven was remade (rather well) as a Japanese samaurai film. They consider it a mark of respect.