The sources emphasize the importance of collaboration between SEO teams and other departments within a digital marketing agency. The author argues that SEOs, with their expertise in research, copywriting, technical insights, and digital PR, can bridge the gap between various marketing disciplines. This collaboration creates a more cohesive digital marketing strategy that enhances overall effectiveness and delivers better results for both businesses and customers. The author emphasizes the value of sharing data and insights across teams to understand the customer journey and align metrics, ultimately fostering a more customer-centric approach to digital marketing.