@IDatedSuccubi @beta_tester That depends on what “fully mapped” is - a lot of my mapping tends to be tagging, not creating new objects: for ways - maxspeed, surface, lit; for POI nodes - opening_hours, wheelchair. Buildings - building_levels, roof:shape, building type (building=detached/apartments/commercial/shed/…). StreetComplete is efficient in terrain.

Also, many artworks lack any tagging beyond tourist attraction= artwork, but that requires some detective work beyond mere mapping;)