Somebody: We're still faced with the fact that Soviet-style socialist states stall out economically and require reintroduction of market mechanisms to further develop their productive forces. I agree that Western welfare states and social democracy provide an alternative, but then this only confirms that full nationalization of the commanding heights of the economy is less than optimal over the long-term, On the other hand, strategic nationalizations and selective industrial policy, as seen in countries as varied as France and South Korea in the recent past, and China and Russia today, is much more conducive to sustainable development.
Sure, East Germany, Poland and Hungary were better off than Romania, Albania, and Bulgaria, as they still are today, but considering their common historical trajectory, it's unclear if they provide any evidence that an indigenous socialism would have succeeded over the long-run where the Soviet variety did not. Cuba's relatively high state of development in 1959 helped enable the impressive degree of human development achieved in the country in the decades thereafter, but ultimately, their system as an economic model is still being at least partially abandoned today.