If you're at war with opponents who can field advanced military units at the beginning of a Dark Age, adopting this policy will help you hold out until you can make peace with them. You'll want to replace it as soon as possible, though, because they'll have a stronger incentive to go to war with you again when their Grievances against you aren't decaying.
Civilopedia entry Edit
The highly interconnected weapons systems of the information age rely on a mix of military and commercial components, processes, and software, creating what is essentially a new logistics reality for military professionals. Although interconnected weapons systems provide enhanced firepower and effectiveness (as anyone who’s witnessed highlight reels of smart bombs striking can attest), they do create a potential weakness. An opponent can attack the computer infrastructure of a modern military, often achieving better results than if they had tried to attack that same force directly. "Cyber Warfare" can roughly be defined as a formal attempt to degrade, destroy, or weaken the communications and computer infrastructure of a modern military. Some military theoreticians also use this term to refer to operations against civilian targets, like power grids.