Think about it. Here, you've got all kinds of people from different worlds and times. I wouldn't want someone randomly telling me what happened in my past, or how I could be written about in some book for events I haven't gotten to yet. [ Stated as someone who has no idea how significant his life choices affected the outcome of the peace and prosperity of his planet, at all. ] That's kinda creepy and I'm pretty sure that violates some kind of temporal directive or something.