Aircraft like the A-6 and A-7 would be more use as bomb trucks in Iraq and Afganistan but they have one issue that a pointy jet such as the Hornet and Super Hornet that do their job today, they can't defend themselves. A pointy jet can drop bombs and fly as a fighter, it may not carry bombs as well a bomb truck but the bomb truck can't act as a fighter. With limited money to buy aircraft you might aswell just by fighters and live with the compromise.