Ah, exactly - I don't think that's why it continued to work. Consider, for example, how quickly and effectively the system replicated itself all over Eastern Europe. Those places had their bloody coups and brief periods of Stalinist terror but nothing of the Soviet scale and duration. Many avoided outright forced collectivization, a few didn't even require a permanent occupying Soviet army. And it still worked.
Even if we can't agree how or why, it's on us to always think about it in the hope it might in some small way prevent it from happening again. In the places that we left or the places we came to.
And because you didn't have the Big Terror to the same extent, life in Eastern Europe was quite a bit better than in the USSR. When we visited a friend in Prague in 1985, he had a collection of "anti-soviet" literature (including Kolyma Stories that would be enough to send anyone in USSR reliving Shalamov's experience. And he didn't even hide it...