If the rules of communism--from each according to his ability, to each according his need--and all that were consistently followed, it would work perfectly.
Nonsense.
From each according to his ability, to each according to his need, how would anyone be able to make rational decisions? Economic calculation is impossible, calculating costs is not possible.
Even if you manage to create this kind of new human, standing on the shoulders of giants, even if it was possible that they liberate themselves and sacrifice themselves for the collective and work for others, it's not going to work.
The socialist dictator (or communal vote) wants to ensure that his people don't freeze in the winter. So he does some brainstorming and comes up with several alternatives. He's got lots of alternatives, he has free reign over all labor and resources. The first alternative he comes up with is, why don't we get a wood-burning stove in every house? Well, we need to chop trees in the winter, but let's just suspend 1/4 of all laborers from work during the winter to go chop trees. Another alternative, you can put one or more electricity-generating bicycles into every home and then people are bicycling all the time to generate electricity. Then he thinks, alternatively, we could insulate the houses better, then we can use the laborers to that end. Or we could install solar panels on every roof, that takes longer and is more technologically challenging. Or we could get a nuclear power plant constructed and use that to heat the houses.
What alternative is the best one?
Obviously, without prices, it's completely arbitrary. Each alternative has its own costs. One option requires more laborers, others require more wood, others require more uranium etc. They also have different durations, so the people need to freeze for longer until the heat finally comes. That means that every alternative uses resources and laborers that aren't simultaneously available for other projects.
If 3/4 of the people are using their bicycles in the winter to generate electricity and heat houses, they can't simultaneously produce other goods. If he goes with the oven option, only 1/4 of the people are busy chopping trees, but the wood that is being burned can no longer be used for the production of furniture, and the forests are no longer nice areas for relaxation or hiking in the summer. Other costs are caused by the solar option or the nuclear power alternative.
The dictator can make a free choice, everything belongs to him, but for the same reason, because everything belongs to him, there are no prices for labor, for wood, for uranium etc. He cannot monetarily compare the costs, his decision is completely arbitrary. And that means that his action is irresponsible. Because he doesn't know the costs, he is going to decide on other criteria. It could be ideological - that he's against nuclear or against solar - or because he's got some friend who happens to be a manager of a solar panel company, then he will pick that alternative. But he does not know, for instance, if he picks the oven alternative, whether the heat that is being produced is worth more than the consumed wood and labor in the eyes of the people. Is the heat worth more than the labor and the wood and the products that could have been created with them? He can't know that because there are no prices. Wouldn't the people prefer enjoying an untouched forest in the summer or enjoy wooden furniture instead of having heated their homes with wood? He can't know that because there are no prices.
In a market economy, when an entrepreneur sees that his costs of chopping trees won't be covered by the revenue of selling wood, he'd be making a loss, he knows right away to abstain from doing that. But a socialist planner is necessarily blind. And thus the system deteriorates in "calculational chaos" as described by Mises.