Developers should design reports with the end-user in mind by ensuring that visuals are intuitive and easy to navigate. Using clear labels, appropriate color schemes, and consistent formatting makes reports more accessible. Interactive features like slicers, filters, and drill-through options allow users to explore data independently. Additionally, incorporating user feedback throughout the development process helps tailor reports to specific business needs. Power BI developers should also ensure that reports are optimized for different devices, providing a responsive design that works well on both desktop and mobile platforms.