Final answer:
The chapter indicates that careful planning and crafting of a message are important for effective public speaking, contrary to spontaneous wit or humor, as it helps maintain audience engagement.
Step-by-step explanation:
The statement that it is better to plan ahead to say something funny or witty than to do so spontaneously is false according to Chapter 21. In fact, the chapter suggests that preparation is key when it comes to public speaking. Unlike social media, where brevity and quick content are king, public speaking requires a crafted message to maintain the audience's attention.
The chapter highlights that while social media may tolerate spontaneity due to its short and simple messaging format, a live audience requires well-thought-out speech to keep engaged, with adult audiences typically paying attention for about 20 minute increments.
Moreover, a wise leader is highlighted as one who blends considerations of advantage and disadvantage together in their plans, suggesting deliberate strategy over improvisation. The ability to vary one's plans and blend different considerations implies a level of preparedness and flexibility rather than spontaneous decision-making.