PGM’s like LGBs, JDAMs and SDB can do the CAS role well.
It is the delivery of ordnance close to friendlies that defines CAS.
Why fly low and get shot at by all the gomers with a gun when you can fly at medium altitude and deliver the same ordnance with the same accuracy.
Flying low is a cool airshow but altitude is driven by many factors, ordnance type, weather and the A/A threat.
I am a former FAC with the 1-01st and a former A-10 driver, so my heart is in CAS, I know the mission. I prefer A-10’s because they can stay around the tgt-area long enough to affect the battle, and the gun gives them a huge punch, either from a 12,000’ high altitude strafe run or 12,000 slant-range low altitude run. The B-1s were either dropping unguided and did not tgt the area correctly, or they dropped JDAMs and had the wrong GPS coords programmed. Don't know.
Good info...