Why naval and aircraft guns returned

Which supposedly obsolete weapon systems have made a comeback?

Guns are the clearest example: they returned to ships and aircraft because sustained, economical volume of fire remains essential alongside precision missiles.

Before the Falklands War, some planners expected surface warships and aircraft to dispense with guns, a view visible in early Type 22 frigates. Operational experience restored the value of a cheap, flexible weapon that can deliver repeated fire. The same logic appears ashore in Ukraine, where drones and missiles receive attention but artillery shells provide the sustained volume needed to suppress and destroy targets.