Understanding a company's approach to user experience (UX) and user interface (UI) design provides valuable insight into how they prioritize user satisfaction and interaction in their mobile applications. This question helps gauge the company's commitment to creating intuitive, engaging, and user-friendly experiences, which are essential for retaining users and driving business success. By learning about their design process, research methodologies, and focus on iterative refinement, users can assess the likelihood of receiving a high-quality mobile app that meets their needs and expectations.