Event sourcing is still the best paradigm for exposing valuable service data to an undefined number of services downstream, especially when there’s enough data to make querying painful for some use cases. They are like a NoSQL buffer between services and databases. Not always necessary but sometimes useful.

Event sourcing brings its own complexities (eg Kafka clients) but it’s still better than having one huge shared database or even RabbitMQ fanout exchanges. In the best cases, developer experience of Kafka can be very good and comfortable. You can write short python scrips that ingest data and dump to other databases and services, it’s very nice. In some cases you want services writing directly to databases but sometimes you don’t.