Consider a Flutter app with deeply nested widgets needing frequent state updates. What technique would you recommend to efficiently propagate these updates?

When dealing with deeply nested widgets that require frequent state updates, using Streams and StreamBuilder is a recommended technique in Flutter. Streams provide an efficient way to handle asynchronous data flow, allowing for responsive UI updates. StreamBuilder simplifies the process of listening to changes in the stream and updating the UI accordingly. This approach ensures efficient propagation of updates in a reactive and scalable manner, making it well-suited for scenarios with deeply nested widget structures.