Initially Business Logic Component (BLoC) pattern was introduced by Google as a solution to handle states in Flutter applications. It allows you to reduce the workload on UI components by separating the business logic from them. Over time, other frameworks also started to support the BLoC pattern – see e.g. how to use the BLoC pattern with React. It brings many benefits of business logic externalization: Flexibility to update application logic, Reuse logic, Ease of testing, Scalability. It is only natural to implement the BLoC pattern using a rule engine and additionally move control over business logic from programmers to subject matter experts. Link