The purpose of most presentations is to motivate the audience to take action. Sometimes that action is obvious, as when a prospect is interviewing competing companies and will choose one.
Sometimes, though, it’s valuable to inform the audience in the opening of the action you want them to take. ”Today I’m going to make a case why we should go in direction A , why that direction is most beneficial to your long term interests and how you can make this happen.”
Even people responsible for making decisions need to be reminded when they have a decision to make. When not asked, most people will not take action.