replication all crashed

hi, all when a topic partition's all isr crashed, the partition is Unavailability, why don't like hdfs when a replication in isr crashed and auto move the rep to another alive one, what's the original intention of this design?

kafka replication all crashed

hi, all when a topic partition's all isr crashed, the partition is Unavailability, why don't like hdfs when a replication in isr crashed and auto move the rep to another alive one, what's the original intention of this design?