Even when the quality of official documentation is high, there are other uses for an SO-like site, I think: - Handling corner cases that the original software

Even when the quality of official documentation is high, there are other uses for an SO-like site, I think: - Handling corner cases that the original software developers never thought of, or their technical writers never thought to document, at least. - Contextualizing, summarizing, and rephrasing the official docs in ways that people at different levels of familiarity and from different backgrounds find easier to understand. - Providing errata and implementation notes that have been discovered over time by the users, before the official source is able to add them, or especially if the official source refuses to add them.