Even if nobody else uses the wiki, I find it can be a helpful
place to store notes for things I rarely use. In this case,
looking at Arch re qt5 modules, I found a (long) list of apps
with details of what they use / links to home pages / their
builds.
Example: before I last gave up on kde I had dropped konqueror
because kdewebkit was unmaintained and full of vulnerabilities.
The Arch list shows it now uses qtwebengine, although the home
page only mentions khtml and kdewebkit.
I know it is somewhat useless, but I don't like them for
two reasons: first they cannot be seen, and I do not like things I
cannot see. Second, git highlights them, and this is disturbing...
