There is an issue with capacity and loiter time in using fighters as strike aircraft. One of more unheralded aircraft of the initial campaign in Afghanistan to take down Al-Q and the Taliban, was the Bone (B-1B). It had capacity and loiter time in spades. A modern bomb truck with more stealth, current engines and electronics, etc., would be very useful.
F-15E has great loiter time and bomb-load and the A-10 can fly a long time and carries as much as WWII B-24 bombers did. . .trying to nail down a definition of a bomber is like defining art. . . .same thing.