I've come across many a smart person who would abhor the idea of listening to a presentation, let alone give one. Give me a document they'll say, and they will go through it at depth and collaborate amazingly over text. A mix of both is required. You don't want everyone to be giving presentations all day, just as you don't want no one to be attending any presentations. Diversity is essential, and it's more effective to create structures that allow different types of people to work with one another than to mould people into personalities.