The document outlines the critical importance of customer experience (CX) as the primary differentiator for brands by 2020, emphasizing the need for businesses to prioritize customer desires in their decision-making. It discusses strategies for enhancing CX, particularly in email marketing, such as understanding the customer journey and creating personalized, relevant interactions. The document also highlights the challenges marketers face in managing customer data and emphasizes the integration of data and systems to deliver effective, consistent experiences across various channels.