We need an eraser for this eraser
The main point of these erasers on top of the pencils is to be convenient. It reduces the number of items we have to carry around and the possibility of losing a small eraser (which happens a lot).
The convenience is often overshadowed by sheer anger when we figure out that these erasers cause more mess. They don’t erase but smudge the residue all over the paper. Is it so hard to put a decent eraser on top of the pencil?