Flutter architecture discussions often begin with folder names. Production problems begin with unclear ownership, provider models leaking into widgets, duplicate requests, and state that cannot explain what the user is seeing.

Give every state one owner

A screen should not reconstruct business truth from unrelated booleans. Its controller, notifier, or bloc should expose a state that explains what is happening and which actions are valid.

sealed class CheckoutState {}
final class Editing extends CheckoutState {}
final class Submitting extends CheckoutState {}
final class RequiresAction extends CheckoutState {}
final class Completed extends CheckoutState {}
final class CheckoutFailed extends CheckoutState {
  CheckoutFailed(this.message);
  final String message;
}

Closing perspective

Pragmatic architecture gives product state a clear owner and turns external systems into replaceable details.