As I understand it, rST and Asciidoc are roughly equivalent in that they provide significant document-oriented upgrades to Markdown - upgrades that are on the order of Docbook. This makes them attractive. But you won't convince me that cross-document deep linking is a solved problem unless you accept that the use case is a static document base. Anything to do with products under continuing development is going to bring headaches. Is there any CMS that "solves" this in a robust way ? I wonder.