Atomic Design is a popular method for creating user interfaces by organizing components into a hierarchy: atoms, molecules, organisms, templates, and pages. While it excels in building consistent UIs, it faces limitations when applied as a comprehensive application architecture. The core issue isn’t Atomic Design itself, but how developers use it. As applications grow, components that start as simple organisms often evolve into complex entities that manage data fetching, business logic, and state management, transforming them into monolithic structures that are difficult to test and maintain. The author emphasizes that Atomic Design should be limited to UI composition. It does not define domain boundaries or manage application flows. Components should only manage ephemeral and interaction-related state, avoiding global data or business logic. A strict dependency rule is proposed: UI components must not import anything from feature modules. This separation keeps the UI reusable and maintains architectural clarity. By separating UI from application architecture, developers can enhance both the codebase and testing strategies. UI components can focus on visual aspects, using tools like Storybook for testing, while features handle business logic and state management. This division allows for better scalability and clearer responsibilities within the code, making it easier to manage growing applications. The article sets the stage for a deeper exploration of feature-driven architecture in subsequent pieces.