War Is Boring have been running a series of articles over the past year or so about the effectiveness of the A-10 for CAS, and about how the F-35 is a "jack of all trades master of none" compromise that is also terrible at CAS.
They paint a compelling picture that the Air Force is stumping to ditch CAS as "unsexy" so they spin as hard as they can against the A-10.
Example: https://medium.com/war-is-boring/now-the-u-s-air-force-wants...