jQuery Forum

The reason is that there could be any number of things you might want to do at the end of dragging with a helper:

- nothing (maybe the drag didn't end in a drop and you only want to do something in case it did)
- animate the element to the new position
- move the element in the dom
- clone the element

Not only could that list go on and on, but you could combine multiple things, such as cloning and animating the clone. If we did anything by default we'd have to choose one of these and build it in and that would only facilitate that select number of users that were wanting that thing done. Everyone else would need a way of cancelling that built-in default so they could do their own thing.