In this great age of communication, there a lot of people you can't actually understand. I know everyone tweets, and twits and texts and all that, but actually we've all got voices, and it is awfully nice to hear them and if you can understand what people are saying.
No one in the whole movie ever asks anyone, Did you write this letter' Part of the reason is that no one wants to hear that it isn't for them. As soon as they read it, they want it to be theirs.