The A-10 was designed to be effective flying into the teeth of the Warsaw Pact.
It can lose a lot of parts and return home.
I have seen a photo of an A-10 which had an engine shot full of holes but then most twin engines military planes can make it back with one engine.
An Israeli F-15 was able to make it back to base without a wing. Yes the wing was missing on one side.
I have also seen a report of one being shot down by a hand held surface to air missile.
I like them and they definitely have their uses but they are not invulnerable.
After the first 15 seconds on contact, any low flying plane or helicopter would have been on borrowed time back then ...