I don't think it should be about holding white women as the standards of a good performance
Is this person believable? Regardless of whatever they've studied, does it seem as though this character is real and living honestly within the circumstances of the story?
Taraji RARELY does that. I'd have to see more from the other girls, because only a couple movies/shows come to mind.
But again, they'll hardly get to showcase diversity in this white industry.