I often find the confusions comes from not clearly understanding what is being communicated, and what you think the other side expects. The slide deck format, is often build from top-down hierarchy. Slides for areas A, B, C. When really you might have a narrative where you want to convey the material from C, with A & B as footnotes. Are you telling a story or writing the table of contents for textbook?
Agree it isn't the be all end all - but it does force someone to think about the narrative and, to your point, who you are speaking to and what you think you need to communicate and also to try and figure out what the other side expects/knows (which is a tough thing to do).
