Companies are collections of people, and people are collections of hours. With goals and strategy, you are choosing how to spend those hours. If you have too many priorities, people will peanut butter their time across all of them of just pick the ones they like the best. If you want to make the best use of the hours, you need to be focused and clear. Either you make the painful choices and prioritization or people will do it for you by choosing how they spend their time.