There's a spectrum of streaming systems from simple, stateless processors to complex, stateful distributed processors. I'm not very familiar with Benthos, but

There's a spectrum of streaming systems from simple, stateless processors to complex, stateful distributed processors. I'm not very familiar with Benthos, but it appears to be on the simple, stateless end. Systems like that can be great if they fit your use cases—they tend to be much easier to understand and operate. But they are not as flexible or powerful as stateful systems like Arroyo or Flink. For example, they cannot accurately compute aggregations, joins, or windows over long time ranges.