Message-Driven architecture vs REST-APIs

A question I often get: "Do you use message-driven architecture just because REST APIs are slow?" - Well… yes, but actually no. There’s much more behind that decision. Why use Message-Driven architecture Cross-device support The messaging systems allow for real-time communication across servers, desktops, web & mobile apps — all decoupled and event-driven. Asynchronous communication REST API forces the sender to wait. Messaging lets you offload heavy work to background consumers while the app stays responsive. Supports monoliths The producer-consumer architecture can be used within a single service using in-process events. Multi-destination delivery With REST APIs, the sender needs to know the exact endpoint of each receiver. Messaging system publishes to a topic — whoever’s subscribed gets the message. No need to know who or where they are. Retention REST API fails if the receiving server is down. Messaging brokers store messages until consumers reconnect. With TTL, you can contro