From wiki "...the primary name would be the most obvious name of the feature, the one that end users expect data consumers to expose in a label or other interface element."

As to me saw few hundred building only tagging as "block 1" and the navigation app do not add the estate name to the building, I'm quite f***ed up at the end

also on mapnik it do not show both estate name and building name at same time, searching more for just because the name is separated is costing me and others life.