duplexer2 simplifies creating duplex streams in Node.js by combining a writable stream and a readable stream into a single, cohesive duplex stream. This eliminates boilerplate code often associated with manually piping streams together. Ideal for scenarios requiring both input and output on a single stream, such as transforming data or proxying connections. duplexer2 enhances code readability and maintainability when dealing with complex stream pipelines.