Precise coordination is now available via data-link. CAS remains something driven by the GROUND commander.
Nothing beats hits on target, too - which is easier when you are not at 100’ trying to avoid hitting the ground AND still hitting the target.
I’m an A-10 fan, but they’ve made mistakes too.
They have indeed: when I had an artillery battalion, I had a truck in my motor pool that looked like a colander with small shrapnel holes. It was hit by a "friendly" A-10 that didn't know what our stuff looked like.
Another important reason for our flying comrades to spend more time with the ground-gaining folks to learn how we do our job and how to best support it.