The author recounts a Zoom meeting where an Information Architecture (IA) Tree Diagram is being "demoted" in its role. The IA Tree, a sitemap, struggles to adapt to the needs of complex product design involving relationships beyond simple hierarchy. The team finds the IA Tree inadequate for showing relationships, cardinality, and evolving system interactions. The team decides to use class diagrams, which can illustrate objects, attributes, and relationships, instead of IA trees. This shift reflects the expanding scope of design work, requiring designers to map complex systems. The author admits the IA Tree's limitations in representing modern system complexities like course registration. The IA Tree reluctantly accepts its reduced role, offering to still handle navigation and content hierarchy. The writer acknowledges the IA Tree’s strengths in early design stages. The author emphasizes the need for diagrams that clearly show system connections and evolution, and not just content location.. In conclusion, class diagrams better facilitate structured design of complex systems.