why contribute?

Everyone is talking about Macromedia's Contribute. But what I don't understand is that how it's so revolutionary. How more easy to use is this than a customized content management system? If this has something to do with being able to edit static webpages without having to open them in DreamWeaver of Frontpage, how about a Wiki with a WYSIWYG edit box?

If I were to make an easily updateable website for my clients, I would make each blob of text a node, and use PHP to program it so that it showed the site HTML when everyone visited it, but showed in place of the content a text input box when the owner logged in. To change anything, simply edit the present text in the box, and click on the save button. The PHP script substitutes the text, the site is updated.

Why is this sounding so simple?