when should you start thinking about an event-driven architecture

hey everyone, i've been seeing a lot more talk about event-driven architectures lately, especially with microservices. it seems like a natural fit for decoupling services and handling asynchronous tasks. but i'm curious about the tipping point. when does it make sense to introduce event buses or message queues into your system? are there specific use cases or trade-offs that signal it's time to move away from simpler request-response patterns? looking forward to hearing your experiences.