Outside of using Gulp JS and Stylus, I don't really see much of a point myself either, but where it gets interesting is the structure.

Example: https://github.com/mozbrick/brick-menu/blob/master/index.htm...

It looks like the library is pre-pended with a bunch of brick elements, based off its Minimal-markup Web Components.

They really do a bad job of explaining this on their brick page as right now, looking at it you'd assume its just yet-another-front-end-framework. Its not compelling (yet), but still of interesting.

https://hacks.mozilla.org/2013/08/introducing-brick-minimal-...