On the other hand good documentation is essential if you want many users. I think that O'Reilly, Coriolis, New Riders, and the other publishers have had more to do with the wider use of open source in the last 15 years than ESR and the FSF itself.
Architectural documentation and user documentation are two completely different things. User documentation is what O'Reilly does. Architectural documentation is what Oracle is claiming to have done.
