Is Store needed for all Angular applications or not? If not, which ones need it?

Store (for example, NgRx) is not necessary for all Angular applications. It is justified in cases where the application has a complex state that needs to be centrally managed, synchronized between different components, or when predictability and change tracking (for example, for debugging or undo/redo) are required. In simple applications with a small number of components and local state, using Store can be excessive and complicate the architecture.

In summary, Store is needed for Angular applications where:

• there are many interacting components with shared state;
• complex state management logic;
• scalability and maintainability are required;
• predictability and state debugging are important.

In simple or small applications, services and local component state can suffice.