In the beginning of a presentation design project, things are fluid. You are open to different approaches to tell the story, the look and feel of slides. But once you created a good first draft, you become hesitant to change it, even when smart people give good advice. I have seen many decks that started with an apology: this was the slide deck that they used since last year, but now we tell the story a bit different. Have the courage to change your presentation as your story evolves.