So while I cannot really practice sword fighting, (because it's too dangerous to engage in) I am interested in studying it. So we attempt to create situations that "might appear" and see how Aikido theory may apply to those situations. This is contrived, but is the lessor of two evils (in my opinion).
But you can really practice sword fighting, if that is what your goal was to do. Based on your other comments "sword fighting" isn't really your goal. And that is fine.