That remained a talent for how many years after it was implemented? Dwarves, Evokers, Surv Hunters and paladins can counter Assa Execute with a racial and the classes their abilities which is why I think Blizz is going to keep it in. The execute remains in its full effect in pve still. The 10% change is for pvp only. You will need to hope its beyond broken in pve for it to be removed.