Here's the insert from the update shared in the patch notes where the dev explain it!
A week ago, we introduced our change to map services for the #20.1 patch. In the Normal Match pool, Miramar was to be replaced with Deston.
We’d first like to share our intentions on this change.
As we monitor graphs on players’ map preference in all regions, we were able to see that players preferred Deston over Miramar. Also, the dodge rate in Miramar was confirmed to be highest in regions with random map selection, while the pick rate for Miramar in regions that had the map selection feature were extremely low during Update 19.1 and 19.2.
Therefore, our decision to replace Miramar with Deston in Normal Matches were mainly based on the data above.
Additionally, we indeed planned to include Miramar back in to the Normal Match pool as a rotation map in #20.2 so players would be able to practice matches in Miramar before heading over to Ranked.
Howeve...
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