KA:
That's interesting; I had not heard of GPS mortar rounds, but I'm from an older-school of CAS.
But the remark: "as accurate as JDAM" is the crux. Sometimes bombs aren't optimum (extreme danger close), and high-calibre airborne guns ARE.
But for that, I prefer a lower-tech airplane with lots of loiter and weapons....think we're only the same page there.
The public thinks cruise missiles can hit any target, but they are of course range and PAYLOAD limited....really, the modern equivalent of Doolittle's raid: damage, but often not enough to change the order of battle.
Bombers fall in two categories: bomb-trucks (BUFF), stealth deep strike (B-2), and one that falls in-between.....
Like you, I see no pressing need to develop yet another stealthy deep-strike aircraft.
Eisenhower must be shaking his head.....