[ethanbond]

I'm not sure how you come to this distinction between internal/external. The delineation is much simpler and more obvious. Is Blueprint made for mobile use cases? No. Therefore it's highly optimized for non-mobile use cases. Despite the buzzword focus on mobile applications, there's still plenty of work being done (and left to do!) outside of that. For those uses, Blueprint is great!

This is especially valuable for teams that don't have the design talent necessary to generate something as visually rich and feature complete as Blueprint. But you're right, a mobile framework it is not.