The document discusses how being reactive is good. It argues that reactive principles like being asynchronous, non-blocking, elastic and resilient help engineers, businesses and enterprises capture opportunities. Being message-driven and responsive to events within the business and market allows systems to scale efficiently. The Lightbend Reactive Platform and tools like Akka and Play can be used to build fully reactive microservices systems that are responsive, elastic and resilient. Reactive architectures allow modernizing existing systems and responding to changes in technology, users and opportunities.