Lambda Computing with Minio and Apache Kafka

I've seen a lot of posts recently on event driven architectures. (ex. [0]) Even Redis is getting a kafkaesque stream data structure [1].

Does anyone know more about the downsides of these systems?

I can imagine as they get bigger, there may be issues with tracing the effects of things that happen from the producer's perspective. Like, what happens when a file get's put into this bucket? You'd have to know about all the consumers and who acts on this particular event and in what way.

[0] https://medium.com/netflix-techblog/scaling-event-sourcing-f... [1] https://brandur.org/redis-streams