No, the problem was that the Georgian-Russian War exposed a severe weakness in Russian systems, particularly in the area of ECM and reconnaissance. In the Vietnam War, American B-52D's caused severe disruption to the North Vietnamese air defence systems by effectively jamming their radar systems.
And do you think that china´s ECM can withstand US/japan countermeasures? those bombers would be too much eggs on a few baskets. A military with inferior tecnology must build small size and big numbers to stand a minimal chance.