At some point you just have to spend spare cycles on ideas you think matter. What's harder than rejecting an idea is rejecting a finished, working product. And if your team says "I wish you had worked on something else", that's great, but if you're not my boss and and they're happy, who cares? And sometimes even your bosses. If you believe in something hard enough you will build political capital by meeting work obligations and spend it down working on your baby.