Two weeks ago the rendering of landuse=conservation was dropped from the default rendering on openstreetmap.org. While the landuse=conservation has problems, it is used quite a lot in near my home. I was originally worried about what it would mean to how the map would look with this tag missing. However, when the landuse=conservation was dropped, other tags were used such as leisure=nature_reserve, and landuse=forest for rendering. To my surprise, the new rendering exposed tagging problems that were not apparent with the older rendering style. I have been fixing them over the past week.
Everybody knows that the default map is a force on how the data looks, and in theory designed for mappers, perhaps we should mix up the rendering style every once in a while to emphasize different kinds of data. For example, November/December can be addresses, January outdoor sports, February public transportation, March railroads, April hiking, May political boundaries, June land use, July coastline, August rivers and lakes, September highways classifications and routes, etc.