Many content marketers lacked the knowledge to implement SEO best practices and, similarly, many SEOs were not well versed in the importance of quality content. (Remember the good old days of keyword stuffing?)
These two types are marketers are driven by two different sides (hemispheres) of the brain. Left-brain marketers (the traditional SEOs) tend to be analytical and numbers-driven in nature. Right-brained marketers (the traditional content marketer) are more open to creative concepts and imaginative storytelling.
Yet, with the fusion of media comes a fusion of minds. The modern-day marketer balances left- and right-brain thinking. They use SEO and technology as an enabler and distributor, using content marketing creativity to build holistic content and SEO programs that result in measurable business outcomes.