But the problems went deeper. The Soviet Union came to grief because of a lack of trust. The economy delivered only for a small, privileged elite who had access to imported western goods. What started with the best of intentions in 1917 ended tarnished by corruption. The Soviet Union was eaten away from within.
If that were so then all of the different communist regimes would have had some variance in their outcomes, as they did not all suffer from the same levels of corruption. The fact that all of the communist regimes suffered the same fate, complete and total economic collapse, or the complete absence of anything that resembles an economy developing where they had not inherited an economy, tells us that there was something more fundamentally flawed about the plan.
Like, planning is a bad way to run an economy.