I hust had a look into the OSM Wiki and the Tag-Proposal process. It seems, that there is a lot of proposals that is outdated. There is about 400 proposals on as “under way”, of which most are not even set in “draft”, but date back 2 - 5 years.
http://wiki.openstreetmap.org/wiki/Proposed_features/Condo (last modified 2008)
http://wiki.openstreetmap.org/wiki/Proposed_features/landuse%3Dtrees (last discussion from 2011) [sidenote, I am actually interested myself in that topic)
as mentioned in the description for proposals, these outdated proposlas should be marked as abandoned, or else at some point, or am I wrong?