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(3)  Kafka admin want to reduce the expansion times for local disk when remote storage down for a long time. after all. The already uploaded segments are eligible for deletion from broker when not enable the feature for topic.
      You can check the follow picture ( Configure: 1 day local + 3 day remote. and set the delay to max value: the local retention time/size) to understand the logic: 
      (a) If the remote storage outage for a short time:  no matter if you enable the feature. it don't have difference. . (So if you don't set the delay to max value. you have more time to avoid expansion)
      (b) If the remote storage outage for a medium-term time
            You will need one extra expansion:  the max size is the your saving cost's part. You can think you should return back the save part/redundancy by expansion.

      (c) If the remote storage outage for a long time (check the 48 hours' outage example in picture)）:  
             No matter if you enable the feature. you should keep doing expansion due to remote upload failed.

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