I think you've hit on something important with work and accomplishment. I've heard software developers say over and over again they don't feel like they've actually accomplished anything when they complete some coding task. It's not just bug fixes, but tasks in general. Some of them take up hobbies like woodworking, where the results of your work are something tangible you can see and touch. But it's not just software development, a lot of jobs involve work that seemingly produces nothing despite the time and effort spent. It's not hard to see why so many people find their work miserable.