Just a smoother activation. In the screenshot I’m not having to coordinate clicking the left mouse button 5 times as I drag down lines 3 to 7. In Obsidian you have to discretely move and click on every position. Here, I’m proposing that dragging the mouse will set all the cursors in a single, motion.
The related (Alt + up/down) is better than this, but either are nicer than discrete positioning in a workflow.