Except that the burden is on all clients to coordinate to avoid processing an event more than once since Kakfa is a brainless invention just dumping data forever into a serial log.
Do you mean different consumers within the same consumer group? There's no technology out there that will guarantee exactly-once delivery, it's simply impossible in a world where networks aren't magically 100% reliable. SQS, RedPanda, RabbitMQ, NATS... you call it, your client will always need idempotency.
Except that the burden is on all clients to coordinate to avoid processing an event more than once since Kakfa is a brainless invention just dumping data forever into a serial log.