this doesn't really answer your question directly but I think it is at least tangientally helpful to see Xi's take here:

Why did the Soviet Union disintegrate? Why did the Communist Party of the Soviet Union fall to pieces? An important reason is that in the ideological domain, competition is fierce! To completely repudiate the historical experience of the Soviet Union, to repudiate the history of the CPSU, to repudiate Lenin, to repudiate Stalin was to wreck chaos in Soviet ideology and engage in historical nihilism. It caused Party organizations at all levels to have barely any function whatsoever. It robbed the Party of its leadership of the military. In the end the CPSU—as great a Party as it was—scattered like a flock of frightened beasts! The Soviet Union—as great a country as it was—shattered into a dozen pieces. This is a lesson from the past!

—Xi Jinping, 2013