Case studies hold significant importance in UPSC Mains answers as they provide concrete examples that reinforce theoretical concepts. Including relevant case studies in responses showcases analytical skills and the ability to apply knowledge to real-world scenarios. This depth of understanding can differentiate a candidate from others by providing a well-rounded perspective on issues. Additionally, case studies often open up avenues for discussing potential solutions or lessons learned, enriching the overall quality and relevance of the answers presented in the examination.