While Nextend offers significant advantages, it introduces complexity in two areas:
| Feature | Traditional Middleware / Plugins | Inheritance-Based Extension | Nextend Framework | | :--- | :--- | :--- | :--- | | | High (Direct API calls) | High (Tight structural binding) | Low (Schema-based Lens binding) | | Runtime Flexibility | Low (Requires restart) | None (Static) | High (Grains can be hot-swapped) | | Execution Model | Linear / Pipeline | Hierarchical | Graph-based / Parallel | | State Safety | Low (Shared Mutable State) | Medium (Encapsulation) | High (Shadow State Isolation) | | Testing | Integration Heavy | Mocking Required | Unit Isolated (Grains are pure functions) | nextend