Because Psylocke is literally yellow faced character. And every time you want give Marvel/Xmen credit having for an Asian woman front and center in the Xmen you have go nope she is British white woman in Asian woman body.
It is interesting Scifi I love Alter Carbon for example but how Psylocke is used it would be better if she was in her original body or recton to half Asian. The most prominent Asian character in superhero comics is actually a white woman if you don't see what issue I don't know what to say about it.