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Since Kafka 2.4.0, it is possible to rely on the broker default replication factor setting when creating a topic . (cf KIP-464: Defaults for AdminClient#createTopic). Kafka Streams did not adapt this new feature yet, due to backward compatibility concern. However, it puts some burden on users to change the Kafka Streams default replication.factor config of 1 when they put an application into production. While user are already able to change the config to -1  if their brokers are on 2.4.0 or newer version, it's still an additional config they need to take care of.

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