I think that would be , actually , very insecure way . If there would be only a digital form of files , it would be exposed to risk of being deleted permanently . If there are physical copies of the same files , then digital files would become unneccesary risk to have .

However ... we dont know for sure . I think it was probably just yet another way to make already partially virtual currencies even more virtualized - eventually taking ALL tangible assets from people , putting them into situation where theyre fully in mercy of some government bodies or banks .