Because practice makes a man perfect. The Steve Jobs example.

Steve Jobs applied the same strict rules to himself, of course. He spent the two days preceding the keynotes rehearsing. "On the first day he worked on the segments he felt needed the most attention. Steve Jobs keynotes were the most important and efficient means of communication for Apple. After all, this is how most of the world would ever see Apple — and Jobs, for that matter. They were used not only to attract the media's attention to new products, or to boost the faith of Apple fans worldwide, but even as an internal tool of communication. Indeed, the secrecy of the company made it so that most employees heard of their company's strategy and new products at keynote unveilings, while watching them in closed circuit TVs on campus. After watching Jobs unveil the iPhone in 2007, Steve's old friend Alan Kay qualified the show, often considered Steve's best, with the words: "Steve understands desire." The product managers and...