The A-10 is in a funny position.
It’s not going to survive in a near-peer conflict, it’s arguably too much aircraft for a lot of virtually unopposed anti-militia type roles, and sensor and weapon technology development has made low and slow suitable characteristics far less critical to the CAS role.
However it is actually in service (unlike cheaper to operate turboprops the US has looked at) and is still useful, though essentially doing the same medium altitude job most other platforms are also doing.
And the US can’t afford the inter-service bullshit of previous decades. No good reasons for the US Army to start operating A-10s now and even if they did all the issues noted above would still very much apply. A shot down Army A-10 (shot down because it was low and slow, and was low and slow only to pander to what some thinks the mission still requires) doesn’t provide better close support than a not shot down airforce A-10 or F-16 at medium altitude using the technological developments that mean they don’t have to be low and slow to do their job.