You’ve just put your finger on one of the problems. The A-10 has legendary loiter capabilities, but it isn’t what they would call a “fast mover”.
The A-10 is a great ground attack, ground support aircraft where you control the sky.
If you control the sky the A-10 can destroy just about anything the enemy has on the ground.
The A-10 is also famous for its survivability. It can take a lot of hits and still get the pilot home.
"Fast Movers" are not so great at Low & Slow CLOSE air support. Some of our best CAS in Vietnam was from the Korean War era "Spads", the A-1 Skyraider. They were a welcome sight!
“Youve just put your finger on one of the problems. The A-10 has legendary loiter capabilities, but it isnt what they would call a fast mover.”
Give me a few A-10’s and a couple of AC-130’s over an active battlefield and I will win every time. Let the F22-35 component keep the sky clear for me.