Because if your topics' throughput is low (say <1000 per sec), all those tools might be overkill as most of them require a new cluster, significant setup and using new framework. This library might help quickly build consumers with little to no extra setup/infra.

Also, Robinhood using this in production says this performs reasonably well and battle tested to handle some operations behind a popular app such as theirs.

Definitely excited to try this out to see how this fares compared to Kafka Streams and Spark Structured streaming, both of which we use.