Far be it from me to correct Jeffrey Boam, but I think he's only partially right here. Instead of "intellectually," I would say "consciously," and I'd modify his advice to something like "the script (or story) shouldn't try to engage the audience consciously" i.e. the audience shouldn't be consciously wondering what the meaning or theme of the movie is, or how it relates to their life. A movie isn't a philosophical discourse. But emotional engagement means that the audience is always wondering what happens next, or who killed Mr. Mustard, or will love triumph. What massages the audience through their journey is the plotting (arrangement of events). Plot in this sense isn't a skeleton of the story or a paradigm or a formula; it's the arrangement of audience emotional reactions to the events.