So true. Show the receptionist how to use the FTP client and she can update the hours and holidays. Imagine teaching her the ins and outs of wordpress and expecting her to be ok with it or training in the next user.
I mean in relation to what this article is talking about. A simple page eg hours.html or something. I think most folks could manage it. But you're right it would entirely depend on the design and the willingness of the user to take a moment to learn the ftp software and the crash course in HTML it would require. I still think that's simpler than running and operating a full wordpress installation in some cases.