The deprecation was not discussed, and it was not done by anyone at OpenStreetMap Carto, BTW.
However, it is true that this tag (leisure=common)is ambiguous because it is being used for totally different purposes in different countries. So while you might be using it in a consistent way in your region, database users who are looking at the whole globe will have trouble interpreting what it means. That's why it would be better to propose a new, different tag to map open areas of unvegetated land in villages and towns. -- Joseph Eisenberg
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