Agentic AI is rapidly transforming media buying, promising autonomous budget allocation, campaign optimization, and creative testing. But despite the hype, today's systems remain heavily dependent on historical data and human oversight. Their greatest limitation is that they optimize yesterday's winners—not tomorrow's opportunities. The marketers who outperform in this new era won't be those who automate everything, but those who combine AI execution with human-led competitive intelligence. By identifying emerging trends, competitor pivots, and creative gaps before algorithms detect them, marketers can feed AI better strategic inputs and create advantages that automation alone cannot replicate.