Soviets had more hardcore ideologues at helm most of the times until SU dissolution. They hardly allowed their ideology to be diluted without challenge, which made plans infeasible without real time feedback. China's Mao era was somewhat similar to that. After Mao, during fight between Gang of Four and Deng Xiaoping, realistic faction came on top with famous Deng saying "it doesn't matter if a cat is black or yellow, as long as it catches mice". Also China does experimentation at province and city level, with people succeeding promoting to national level, containing pitfalls of bad policy.