I think it'd be really useful for when you check the think process of the model, that it will have a straight line that seperates the thinking process and the answer so that you can see where it ends. Since it's automatically known that it starts with thinking and it's a toggle, an ending line would help to see that it isn't sitting together.
It would make it easier to see the difference between the result and the thinking process, so it is easier for the eyes to quickly find the end of the thinking paragraph.
