Huh? Kafka messages are durable just like Postgres commits are durable. That’s why it’s used for things like Debezium that need a durable queue of CDC messages like those from the Postgres WAL.

There’s nothing inherently different about the durability of Postgres that makes it better than Kafka for implementing durable workflows. There are many reasons it’s a better choice for building a system like DBOS to implement durable workflows – ranging from ergonomics to ecosystem compatibility. But in theory you could build the same solution on Kafka, and if the company were co-founded by the Kafka creators rather than Michael Stonebraker, maybe they would have chosen that.