This is all false, I guess you've never been to Soviet Union nor russia (that country doesn't deserve capital R). Central planning is dysfunctional at its core, ignoring subtleties of smaller parts. Also, it was historically always done in eastern Europe hand in hand with corruption, nepotism and incompetence where apparatchiks held most power due to going deepest in ass kissing and other rectal speleology hobbies, not because they were competent.

I come from one such country. After WWII, there was Austria and there was eastern bloc to compare. Austria was severely damaged and had much lower GDP than us. It took mere 40 years of open market vs centrally planned economy to see absolutely massive differences when borders reopened and people weren't shot anymore for trying to escape - we didn't have proper food in the shops ffs. Exotic fruits came few times a year, rotten or unripe. Even stuff grown in our country was often lacking completely. Any product ie electric ones, or cars were vastly subpar to western ones while massively more costly (and often design was plain stolen from the western companies).

Society as a whole made it because almost everybody had a big garden to complement everything basic missing in shops. The little meat you could buy was of worst quality, ladden with amount of toxic chemistry that wouldn't be acceptable in Bangladesh.