The problem still seems to be governance. Like even in that system some of the workers are involved in regulating the infrastructure of production and that necessarily means that one person is telling a lot of people what they can and can't do. We don't really have a way to do this that doesn't involve hierarchy. And our little monkey brains love a hierarchy.

So that's the real problem of communism. Because otherwise it is a better system and it should beat capitalism. Unfortunately because capitalism is better at concentrating resources into fewer hands it's better at defending itself from fairer systems.

Also the US having had little physical damage after ww2 meant that the capitalist had a much better base from which to perpetuate itself.