The moment a product becomes successful, the team that built it faces a subtle trap: they start managing the artifact instead of the need it was solving. The 11th-century Confucian scholar Zhang Zai wrote about this as a failure of 'li' — the tendency to confuse the pattern frozen in a thing with the living pattern still moving in the world. His point was that a principle observed in one moment is already past tense; reality is always running slightly ahead of our best description of it. For product managers, this has a precise practical implication: your current spec is a fossil of the problem as it existed when you wrote it. The discipline Zhang Zai advocated — returning constantly to direct investigation rather than inherited pattern — suggests a specific habit: before your next roadmap review, spend time with users not to validate your features, but to ask what problem they're now solving that your product doesn't know about yet.

When did you last change something about your product's direction because of what you *observed*, rather than what you already believed the data would show?

Drawing from Neo-Confucian Philosophy — Zhang Zai (Western Inscription / Zhengmeng, c. 1076 CE)