The benefits of expanding my skill sets are quite nice. As a full-stack designer, I often end up with a more thorough understanding of my work, making it more consistent from research to production phases. Knowing the limitations and what to expect in development, while planning a comprehensive marketing strategy, I can keep concepts realistic. So not only am I more knowledgeable about what can and cannot work elegantly in design, but I also have more realistic expectations before I even start pushing pixels, coding, or creating a marketing release.
My expansive skill set is exceedingly beneficial for the company who will employ me as well! My employer will be afforded a team member who can jump in and help even outside my area of focus. This means keeping teams lean and diversified with less people, and everyone having more of a grasp of the whole-picture.