A high deployment frequency demonstrates agility, development efficiency, and a commitment to quality software, while small batch sizes are essential in reducing bugs during software development by introducing incremental changes that make it easier to test and fix issues quickly, resulting in lower deployment risk, isolated changes, thorough testing, early bug detection, and improved user satisfaction. Together, high deployment frequency and small batch sizes ensure the efficiency of software delivery by helping to reduce risks, increasing feedback speed, and improving the software development team's agility, ultimately leading to higher-quality software with lower defect density, faster mean time to detect bugs, and greater user satisfaction.