I haven't been using the proposed question but if I was and the candidate told me that his accomplishment is to solve many issues and keep the product bug-free

I haven't been using the proposed question but if I was and the candidate told me that his accomplishment is to solve many issues and keep the product bug-free that would be an accomplishment I'd appreciate as well. I've managed a team and there are those who will find a grand solution to a thorny problem or find a solution to something you didn't think of as a problem and there are others who will plow on to fix countless bugs and make the system better for it. Both are needed, and others as well along the spectrum. I believe that knowing your strengths and playing to them would be a way to get the best for both sides. Unless of course the interviewee is looking to change course completely.