Default wiki commit message is crufty
By default, when editing a wiki page, the edit includes a commit message "[Page title] Updated". As a wiki by definition is supposed to be quick, the editor often leaves the commit message as its default. Having no commit message works great when the reason for the change is obvious from the diff and is unlikely to be of interest among all the page's commits.
However, when looking in the history, it's not quick to spot which commits have hand-entered messages. This makes it slower to find a particular commit of interest. The problem is the default commit messages blend in with the hand-entered commit messages. The default messages are thus meaningless cruft to have to mentally filter out. It would be better for the website to offer a blank default commit message, so that meaningful commit messages will be easily discernible.