I agree, the main reason (besides the fact that LaTeX is the greatest for any type of document, and that greatness is extended by XeTeX,) is because I still believe one must have good file structure. As much as CMSes and Wikis are the rage today in web trendiness, you still need to manually organize them in some way, and this doesn't solve the problem that the article hints at about sticking them on a network share. If it's gonna be lost in a network share it's gonna be lost in a wiki or a CMS. The difference is you might not be running an indexing service for your docs on the network share but searching is intrinsic to the wiki.

And also, git for tracking changes, version control isn't simple, I find that MediaWiki's version control is more annoying to use than git.