Right, but what if you're borrowing a computer. I completely agree, it's more private, but it might lose some of the ease of use.
I think a bug rain that things like Statemic and other databaseless systems are popular is because they kinda offer the best of both worlds: they have the online editor, and command line-less interface, the popular content management systems; and they have some of the simplicity of today's static site generators, namely the use of a simple markup language, and a last file system.
I see the appeal, and have visited considered building my own, but haven't because my existing Jekyll/custom python systems work fine for me right now.