Mistake

A thing that West German leftists don't get about real socialist way of economy is: They didn't invent it anew how structures to produce look like, or did an economy like a hippie community. They only took the old structures known from capitalism and erased the circumstance of having a feudal lord as an owner.
No private person alone or a group was the owner of a facility, the manager administered the factory according to a non-material idea that was "acting for the good of all other employees that work here". If he didn't do that and abused his position, he could be replaced by will of the other workers employed at this entity.
Everyone had his firm position, knew what set of tasks he had to do every day.
If you wanted to take a different position than your current one, you just moved up the ladder through the coventional way. Education or changing the branch, for example.
It wasn't like "today I do one thing" and "tomorrow the other", something unsteady - something that no-one can calculate with, much less raising a family.
Or something that requires all part-takers to be a firm believer of a certain thing to let this thing last.