When dragging an arrow from one shape in a direction to create the next shape at the end of an arrow I often find myself wrestling with the direction the app decides to put the arrow in, making me have to grab the arrow and reorient it after creating the second shape. Now if the arrow’s path approximately followed the line I instinctively drew in the first place I wouldn’t be repositioning arrowheads nearly as much.
tl;dr: Make arrows follow an approximate mouse-drawn path