One thing the Communists were really good at, when they took over a
country, is giving a lower-middle-class lifestyle to almost everyone,
and keeping it there. In economies that could have integrated with
the west (Cuba, East Germany, Poland, Czechoslovakia, Romania, even
North Korea) this was really bad. In economies that started out
tremendously, and bitterly poor (the Soviet Union and China) this
wasn’t necessarily a bad deal.
I think India now is what China would have been if the KMT had won the
civil war. More-or-less western government tend not to go crazy, so
no cultural revolution, no great disruption, etc. But Communists
countries tend to do far more for the extreme poor, so you get
gigantic slums like in Bombay which simply do not exist in China.