Varun's response lacks specificity regarding the development and integration of a RESTful API. Instead of focusing on the technical aspects and scalability measures, he discusses requirement gathering and stakeholder engagement, which are not directly relevant to the question. The benchmark response highlights key technical strategies like caching, connection pooling, and load balancing, which Varun's response does not address. To improve, Varun should focus on specific technical implementations and scalability strategies used in API development.