I'd love to give a concrete example, but without voice inflection I'm afraid doing so is just going to muddy the waters. So here I go trying to explain without an example: Often I'll use a comma in one place or another, and someone will come along and say something like, "Oh, you don't need a comma there." Then they'll go on to read the sentence and announce, "See, no pause." That's not how I intended the sentence to read. I intended to have a pause there. It's my character's voice. He may not speak exactly the way you do, or put emphasis the same places that you do - but he is not wrong to do so. I put comma's in (amongst other reasons) to show where the pauses are, not to have someone ignore them and change the nature and meaning of the sentence. So what do you do? How do you keep editors from correcting non-errors?