Absence Of A Central Control
When you buy a CMS, it is obvious that you want to decentralize control of your content, thus getting rid of all the constraints that surround your content posting. But one consequence of this action, which would majorly affect your content is the lack of central control. Without an editorial control to ensure quality and accuracy of your content, it is more like a troop of haywire soldiers without a king to ensure their actions.
You might argue that the CMS do provide tools for an editorial control of a content, but would your prefer these tools over a good editor? The lack of accuracy and precision makes these tools a rare sight among most of the website users. To overcome this drawback, presence of an experienced content editor to look into the content and review them before posting it online is a good way of having a central authority over your website content.