Recently, I have realized that many OSM features are ignored by the standard map layer. For example, Offices and Pipelines show up in JOSM, but they are completely invisible on openstreetmap.org itself. This makes sense in OSM because these features are insignificant, and most people don't want to see them.
However, OGF is a different case. It doesn't have "insignificant" features. Every node, line, and area is intentionally placed by the map creator, for aesthetics and realism.
Perhaps we should edit the Mapnik rendering rules in order to allow more features to be displayed? (A quick Google search makes it sound like it wouldn't be too hard of a task, but I haven't done it myself, so I apologize if I am wrong.)
Particularly, it would be nice if features like Offices were displayed, since they can make up a large portion of city buildings.