There's what they claim to be and what they are. What they claim to be, is a transitional centralized system of government aimed at jump starting communism. What they are is that without a mechanism or plan to transition. Ending up in EVERY SINGLE GROUP that has tried devolving into an authoritarian suppressive system. Benefitting largely those at the top.
The Party heads in Moscow benefited far more than the average citizen of the Soviet Union. Nearly every modern Russian oligarch has a direct line that can be drawn back to former party leadership. Xi Jinping does not live in government block housing like a regular citizen. Nor do any of the families of top party members. And should a Chinese citizen complain. They will be brutally ostracized and excluded from society at best. Jailed for life or slaughtered if they're not so lucky. Capitalists salivate about being able to do that with impunity. They still do it. Just not with impunity yet.