I want to comment on your thought that fulfillment is tied to career growth. That's true to an extent; if someone is passionate about their product/service, they are more likely to drive results and make a business impact.

On the other hand, it may be "boring" things that actually cause you to grow and level-up. "Engineering excellence" is a good example: writing documentation, improving on-call experience, finding gaps in processes, reducing tech-debt and so on. Especially at a senior level, you will not achieve growth simply by completing the tasks assigned to you. You need to be pro-active in finding gaps  and problems, getting buy-in from the team, and executing on that. These can often be tasks that people find "boring" or "unfulfilling".

Lead Software Engineer at Vista