It was just a random thought that popped up in my head. When I was in high school, I took four years of woodshop, and I remember the belt/disc sander being more of a pencil sharpener than anything else. I remember using it a few times when I was just a hair off a cut, but it could have just been done with the miter saw, and the belt sander has a tendency of not being completely square. Working in my own shop, I've never came across a circumstance where I felt that I really need to buy a belt/disc sander, but they make them, so there must be a purpose