File-based routing in React Router v7 – Why keep it optional?

React Router v7 introduces three modes including file-based routing from Remix, but keeps it optional rather than mandatory. The update offers declarative mode (basic navigation), data mode (route configuration with data fetching), and framework mode (file-based routing) to let developers choose their preferred level of abstraction. File-based routing remains optional because it struggles with dynamic logic, complex route patterns, and can become unwieldy in large applications.