AI is everywhere. Durable enterprise value is not. Boards are under pressure. Investment in generative and agentic AI is surging. Models are getting smarter by the month. Yet across industries, one uncomfortable truth remains: visible AI progress has moved faster than lasting business results. The Weight of Intelligence tackles the defining enterprise question of the AI era: why has so much AI capability produced so little durable value? The market has overinvested in model capability while underinvesting in enterprise metabolization. Enterprises do not win by accumulating more pilots, tools, or agents. They win when they can absorb, govern, connect, and compound intelligence across workflows, decisions, systems, and human roles. This book introduces compounded cognition as a powerful new category for understanding how AI becomes governed, cumulative, and economically meaningful at enterprise scale. Part strategic lens, part practical guide, this book shows what leaders must understand, what enterprises must redesign, and what practitioners must do to turn AI activity into durable value. Written for leaders and practitioners across industries, and brought to life through the airline industry as a demanding real-world example, this is a book for enterprise leaders, product and platform builders, implementers, policymakers, and serious practitioners shaping the next phase of AI.