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On the other hand, several Communists (in fact, the ones Zizek is arguing against) very much argue for exactly what you propose: focus on small matters and diffused democracy to avoid centralisation of power. The fact of "real Communism" having been or not having been "tried" is irrelevant to the questions concerning how such a society, if it is possible, ought to be organised. Thought-terminating cliches don't make for critical analysis.
[0] https://plato.stanford.edu/entries/marcuse/#FanUtoRatGra