As an actor of Shakespeare's plays, this book changed much of my way of working from the text. My early training had taught me to give strict attention to every capitalization in the printing and every punctuation mark. What Ms. Stern has done here is not to make me go against that method, but to regard it as an option.
What she has unearthed here, and given to us, is a working knowledge on the printing process which makes some of my early training work obsolete. I still am, and always will be, a text driven actor - but now, having read this book, I feel I can know when I'm being faithful to the author's intention (when I'm following an editor's opinion) and when I'm consciously making a choice that may be great but not necessarily fact based.