I also see how a state which transforms into socialism or communism must be “authoritarian” in that it has to take away factories and land from those that keep it as capital, so that it can be shared.
I think this will never work, or with a very small probability. Power simply corrupts and attracts a nasty kind of people. Personally, I believe that upwards, organic, evolutionary changes are more probable to bring us closer to the ideas of communism, as industrial evolution moved most of the world from feudalism into capitalism in a natural way.