Is it because the sounds are disturbing, marred or any other issue of this sort? Otherwise, I don't really think that a sound set will ever be changed due to subjective opinions as yours; they are legitimate opinions, but I can't honestly recall anyone else ever complaining about his lines (at least, not questioning their appropriateness in the game)
Keep in mind that sounds are changed if there are serious technical problems affecting them. If there aren't, they are not generally replaced, unless there are really many people displeased by them.
Not all sounds can be perfect, especially the ones we have no reference to in the films. I think, though, that the current rendition is quite satisfying and fitting.