So the Air Force whines that the A-10 can only perform in a clean environment, and the F-35 can do the same role and also fend off any air threats that happen to show up. Yet, the F-35’s capabilities in air to air has become questionable, and I think we know the answer to the question of how well does the F-35 deal with a hit from a MANPADS or a ZSU-23-4: not to well.
If the Air Force is concerned if an air threat arrives during a CAS mission, then let the A-10’s do exactly what they are designed for, and have the zoomies higher up flying CAP.