If reports are often ctrl-F'd through for relevant information, it seems likely that many people consuming it are reading far fewer than 90 pages in total - and wouldn't have read the full shorter report.
Perhaps it is better to be comprehensive in government reports than concise, to accommodate a variety of readers who want to drill into different aspects of the report.
(Of course, a PDF may not be the best structure for this! A well-formatted HTML reference with appropriate hyperlinks may be much more useful.)
Yeah, but who is actually going to read a 7000 page report on torture or surveillance? (Assuming these reports were actually published, which they were not)
Perhaps it is better to be comprehensive in government reports than concise, to accommodate a variety of readers who want to drill into different aspects of the report.
(Of course, a PDF may not be the best structure for this! A well-formatted HTML reference with appropriate hyperlinks may be much more useful.)