Your Flat-File "CMS" is not a CMS

There are a ton of these things popping up these days, these small-footprint flat-file "CMS" tools, and I'm here to tell you that they are not content management systems.

Yes, they manage content. I suppose. I mean, you could say they manage content by allowing you to organize your own content in some pre-determined file structure, if that's what you mean.  If you consider that "content management".