Changes can be introduced in real-time if an HTML editor is used. Speed of implementation. Low or no design costs. Richness of presentation retained. Lets users focus on content rather than delivery and conversion.
External expertise can focus on quality of information rather than technical delivery issues.
Highly structured and designed to deliver management information. The installed-base and the relative ease in which simple Help files can be produced will make this difficult to achieve. Ongoing, rapid development. Better site maintenance tools. Better document conversion tools.