Yes, the A-10 is outdated and couldn't tear through the armor of a modern tank like it could to the tanks of Yore. But you also need to remember that the chain breaks at its weakest link. A strafing run from the GAU-8 will absolutely shred the tracks, gun, and exterior sensors of anything it comes near. Sure the crew might live through the concussions and blunt force trauma, but that vehicle is no longer in the fight.