[dak1]

Bootstrap 3 is going in the same direction.

I think it's a matter of orientation. Rather than creating a Desktop site and then scaling it down, you're creating a Mobile site and scaling it up.

I haven't really put much thought into it, but this may actually make more sense, since you're creating the minimum viable product first, and then adding to it, rather than creating a full project and then trying to figure out what to hack away.