All of the aircraft you mentioned are good attack planes. It's good that the A-5 was mentioned. That was a good aircraft that had the wrong role at
the wrong time. NAA should have dumped the linear bomb bay and stuck a conventional bay in it and would have been a much better choice than the F-111
for the Air Force. The Vigilante should still be in service. It was tha good of an attack plane. It the closest the US got to the TSR.2 in the UK,
and predates it. It remarkable how similar they are, really.
Speaking of attack/light bombers, one should wonder what it would have been like had Lockheed got the go ahead for the RB-12, the bomber version of
the Blackbird. There's a Mach 3 bomober that could've seen service. But the XB-70 got it the way.