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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) to understand the logic: 
      if (a) If the remote storage outage for a short time:  no matter if you enable the feature. it don't have difference. 
      if (b) If the remote storage outage for a medium-term time (check the 24 hour' outage example in picture): 
              you will need one extra expansion:  the max size is the your saving cost's part. You can think you return back the redundancy by expansion.
      if (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.

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