Have the figured out how to stop downdraft from the props to not blow away paper off people's desk? Does the drone not embark with hot coffee payload if batter

Have the figured out how to stop downdraft from the props to not blow away paper off people's desk? Does the drone not embark with hot coffee payload if battery is not enough to complete the journey without spinning blades and scalding liquid crashing on people or computers? Can they make it operate at >60dB so people can work? If those questions don't have satisfactory answers, how could it possibly be that this invention "expresses a specific, credible, and substantial utility" such that it is deserving of patent protection?