The issue with bombs is that while they're enormously destructive, they're not the most accurate weapons in the world. Paveway laser-guided bombs were designed to change that. Using Paveway bombs means fewer munitions are required to eliminate a target, and therefore bombing raids are more successful.
They were a major factor in the successful removal of Saddam Hussein from Iraq in 2003, having been used in over half of all the precision-guided strikes against his forces and military infrastructure.