What's that? You've stored your content separately so that you can just regenerate the pages when changing site designs? It's a system for letting you manage your content separately from the rest of the mechanics or the site? The content files are stored on a journaled file system like EXT4 or NTFS? That's fantastic. It's just like a DB backed CMS that stores flat files for cache.
I'm not saying static page generators aren't useful, but I am saying that the difference between that and a cached wordpress install is virtually nil.