I think something important is that the USSR never seemed to manage to generate a cultural hegemony that effectively silenced dissent while giving an illusion that it was tolerated. In order to get people to remember how bad capitalism was you either need to eradicate it entirely enough worldwide that people don't really think about trying to go back, like how no one talks about going back to feudalism because there are no culturally relevant feudalistic states, or you need to much more effectively manufacture consent. Independent bodies manufacturing consent in parallel is clearly far more effective than a literal state propaganda machine. Even if they're simply choosing to repeat state propaganda.