Think it as this:
That might be 'common sense' but Voltaire knows that it is not common! If you are creating a promotional item to a client - plan a head and try your best to create a merchantable quality design. If you do not plan ahead, your design will not look as good because when a task is rushed, attention to detail is limited.
When you plan ahead and finally implement it, you will have time to think through new ideas and develop a outstanding design. Next time you a do a task, remember to do a task right or not do it at all!