Flutter Clean Architecture: Using BLoC to Scale Apps Beyond setState

The article argues that common Flutter patterns like setState or a single catch-all controller break down in multi-team production apps handling concurrent requests, offline caching, and deep links. It recommends a three-layer design, with a pure Dart domain layer, a data layer that maps remote and local sources to domain entities, and a presentation layer built on BLoCs. Using a food delivery platform as the example, it shows a repository implementation that falls back to cached data when connectivity is lost. It also advises modeling BLoC states as finite state machines using sealed classes rather than one monolithic state with many nullable fields. This structure is presented as a way to avoid race conditions and unnecessary widget rebuilds.