User blog comment:BertH/New Forums now available in Labs/@comment-3317930-20121201033408/@comment-3317930-20121202102317

For instance, on the (default) News and Announcements board I might want to address certain wiki-native features, such as popularly-visited pages, popularly-used templates, wiki policies and so forth. (The italicized may be sub-board names.)

It'd help with keeping the board neat and tidy, and making feature/prospect-specific discussions relatively easy to locate; this also helps with minimizing the quantity of boards displayed on the index board.