"People who know what they're talking about don't need PowerPoint"
That's Steve Jobs quoted in Walter Isaacson's biography. Here's the full quotation:
"[...] and they would come with thirty people and try to show PowerPoints, which Steve didn't want to see," Schiller recalled. One of the first things Jobs did during the product review process was ban PowerPoints. "I hate the way people use slide presentations instead of thinking," Jobs later recalled. "People would confront a problem by creating a presentation. I wanted them to engage, to hash things out at the table, rather than show a bunch of slides. People who know what they're talking about don't need PowerPoint."