I'm not saying that there are no losses at all, I'm saying that if they immediately relied not on hand-held anti-tank weapons, but on self-propelled artillery, Russia would have more problems. The vaunted American M777 howitzers also turned out to be zilch, they were delivered without a digital fire control unit.
Each type of weapon has its use. Russians tended to send single armored vehicles out, with no air or infantry support, especially at the beginning of the war. Handheld launchers worked great against those. But when Russians try to cross a river with 70+ vehicles, Javelins would be a waste. Drone-spotted artillery fire seems to be Ukrainian favorite in these situations.
But no, don't send the Armata, it'd be a shame to scratch it, would need to be repainted for the next parade.