Politics generates an immense number of low content or short lived documents. We hope to select and retain only the more definitive efforts.
Presentations are rarely in the format of technical lectures. We only distinguish Reports and Videos - politicians love the TV screens. Obama hardly ever gives interviews to the printed press.
The Overviews and blogs represent current analyses of issues arising. The core materials are the Departmental white papers, regulations, commissioned 'independent' reports, and other areas of fine print which define what is set to happen.