The brevity starts to come in once you begin to use multiple rules inside each nested context, and get into multiple levels of nesting. The point of the @includ

The brevity starts to come in once you begin to use multiple rules inside each nested context, and get into multiple levels of nesting. The point of the @includes (called "mixins") are that they might expand into something much more complicated. Imagine a gradient mixin that expands into all the vendor-specific gradients with the correct syntax.