- individual freedom will be suppressed (because "public good"; can't have greedy people doing greedy things, them weeds need to be killed early).
- since individual freedom is suppressed the regime is naturally going to be autocratic, which means that "the state" is actually a handful of people... who now get to freely decide how they define "public good".
The fundamental error of communism is that in any implementation, it doesn't really have mechanisms to "punish" greedy leadership, only greedy individual citizens. Which is an idea as good as it sounds.