When is a message queue too much, you know

hey everyone, i've been thinking about when its actually beneficial to introduce a message queue like Kafka or RabbitMQ into a system. weve used them for decoupling services and handling background jobs, but sometimes it feels like were adding a lot of complexity just to handle a few asynchronous tasks. are there specific thresholds or use cases where a simpler approach like direct API calls or a basic task scheduler is sufficient, and when does the overhead of managing a queue start to pay off?