

D- day is a great example of why opsec matters so much. The Germans knew that the allies were going to invade, and if they had been prepared they very well might have rebuffed the invasion. But the secrecy worked, and operation overlord succeeded instead of being a bloody failure.
If the target of the military raid had known when it was coming, they could have simply relocated anything actually important away from the target zone.
A useful analogy is probably a boxer and a ring: your opponent knows that you’re going to throw a punch, but you really don’t want him to know exactly what punch you’re going to throw when.
Nintendo made a huge deal about virtual game cards, saving us from exactly what you’re afraid of.
Not as good as what Sony and Microsoft do, where we can essentially install our whole library on every console we have, but it’s about as good as what Steam does.
Plus they’re bringing back a “game share” like feature, so some multiplayer games should be playable in a local family with only one purchase.