The purpose of "cutting the points" is:

The purpose of "cutting the points" is primarily to help prevent water from running into the roofing system. This technique is often employed during the installation of roofing materials, particularly in areas where the shingles meet or overlap. By cutting the points, which are the sharp edges or intersections of the shingles, it creates a more streamlined flow along the roof surface. This design modification reduces the likelihood of water pooling or seeping underneath the shingles, thereby enhancing the overall effectiveness of the roofing system in directing water away.

While other options touch on various aspects of roofing installation and maintenance, their functions do not specifically relate to the direct concern of preventing water intrusion as effectively as cutting the points does. For example, while ensuring better fitting of shingles or reducing material waste are notable considerations, they are secondary to the primary focus on water management in roofing design.