Creating a metrics dashboard with Appsmith and Cube is an efficient way for teams to display internal metrics, saving time and money on development. Appsmith provides drag-and-drop widgets to create web applications without requiring developer knowledge, while Cube serves as a centralized back-end metrics layer connecting to various data sources and allowing users to access the data through APIs. By using Appsmith and Cube, developers can save time by not needing to be experts in both tools, increasing productivity, and providing a low-code platform for creating custom dashboards without requiring extensive development knowledge.