The document lists 7 reasons why marketing may be lacking: 1) it's easy to spot fake expertise without real-world experience, 2) forgetting the big picture and long-term goals, 3) making flawed assumptions without measuring data, 4) following the wrong people and examples, 5) not properly measuring marketing data, 6) being too excited about the business instead of the customer, and 7) offers additional video courses on marketing best practices.