But how do you know that? Unless you have intimate knowledge of each countires present stockpiles you have no clue when they will be time expired. You’ll find some countries keep stockpiles at the ready for decades, Russia being a prime example.

Common sense, lasers are expensive and are going to continue like that for a long time unless battery technology improves beyond of what is feasible with current technology and dumb munitions are usually retired way before their expiration date even if they continue in storage for no good reason half a century after they were produced.

Resorting to old munitions comes in handy during civil wars when expired ammo of any type becomes useful for whoever puts its hands on them first but it’s a thing of necessity. In a conventional conflict smart munitions or improved conventional designs are going to be the preferred option when dealing with advanced point defenses for the next decades.