This sounds like what git-annex does today, except with a front-end. How is it different from this understanding? git-annex stores things content addressed, gi

This sounds like what git-annex does today, except with a front-end. How is it different from this understanding? git-annex stores things content addressed, gives me different views into the data (tags, etc), and supports different back-ends (S3, remote rsync, local filesystem, external disks, etc). Isn't this exactly what is described here?