but unless the imaginary world is nothing more than a costume trunk of empty avatars, all of the interactor's possible performances will have been called into being by the originating author.
Wouldn't this make it so any story will always lack something to allow full agency? People will never fully be able to decide something on their own unless the story was being made right then and there. With prewritten stories, how close are we actually able to get it to full agency? How close can we get to the same type of agency explained at the beginning?