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One use case it enables is rolling updates. You start with a floating ip on vm A. You create a new vm B, check it out and make sure it is doing what you want. You then pause vm A and move the floating ip and any other resources onto vm B. If everything works, you delete vm A. If it doesn't, you move stuff back to vm A and delete vm B.

As far as the user is concerned, they only ever have to know about the floating ip, which doesn't change.