I wonder what is the current state of admin_level on ways, in particular with respect to osm-carto. Historically, the recommendation was to add the lowest admin_level additionally to the ways that are part of admin relations (to help applications that render boundaries based on ways, for examples eliminates the need of "flattening" overlapping boundaries in case you would want to use non-continuous line styles).
However, practically this leeds to ambiguous situations, where for example admin_level=4 is added to islands and might be misinterpreted as administrative "standalone" level 4 entities (with the island name etc.). While a clear separation of administration and coastline could solve this, it would still mean continuous additional maintenance effort due to duplication of already present information. Is there still a serious risk of immature applications that allow removal of ways without taking into account relations memberships? Will the borders vanish from osm-carto if we rely only on relations? Does iD require admin tags on ways? Cheers Martin
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