"Most people" is the key word here. If discoverability hinges on hoping on what they'll try next, then that's not good. And more likely than not they're going to tap again, because why would you drag a checkbox?

If you make the animation nonlinear and pop out quickly, we don't need to hope: they'll see it immediately! It works 100% of the time, rather than only on the x% that try dragging next.