The front-stage design is important — it’s vital in fact. But once you’ve been around the block you’ll learn that it’s only possible if you design the other part right. The part that your UX friends never really explore. The part that you, a future master Service Designer, will need to wrestle with: the backstage. The processes, the technology, even the culture of the team running the service (how else is it going to improve?).
Becoming great at something just takes courage. It takes the courage to find one thing, committing to that one thing, and putting all those other somethings to rest. Find your one thing. Stick to it. Stop trying to do everything.