Originally Posted by Jammat
When you learn a language, the aim is to be understood, and to sound as much as a native as possible, this includes mastering the accent. It makes no sense to be able to speak with a western accent, but choose not to.
Of course it makes sense. Hugh Laurie can speak in an American accent. He chooses not to when he's not playing House, because it's not his real accent. Same with the likes of Andrew Garfield or Henry Cavill, or conversely, Alexis Denisof and James Marsters who can sound like native Brits.