The document discusses the limitations of traditional marketing-mix modeling, emphasizing the need for a paradigm shift to address issues such as short-term focus, neglect of customer perspectives, and the inadequate measurement of multi-touch marketing attribution. It advocates for next-generation models that incorporate customer sentiment and employ advanced econometric methods to capture true marketing impacts, thereby enhancing long-term advertising effectiveness and return on investment. Additionally, it highlights the importance of measuring social media engagement through innovative techniques like the social engagement index (SEI) to better understand consumer relationships with brands.