Indeed, A-10s are great at dropping bombs on militants with no air force or air defences, and at causing friendly fire incidents, but they're really not good at the combat Ukraine is currently engaged in. There isn't really any point sending them unless they start running low on Su-25s, but then they can't really operate their Su-25s properly at the moment either as they don't have the required air support (or Russia's "if they die they die" approach to it's assets).
This next paragraph may annoy people who had a model of one as a kid, but the A-10 is not a good aircraft. Built for a war that never happened and overhyped by a reputation and capabilities that it never earned nor demonstrated, it has repeatedly failed to live up to the hype every time it's been deployed, the only reason it's still in service while more capable aircraft like the F-111 have retired is because the people making those decisions have more knowledge of the hype and not it's actual combat performance.