True. Karl Marx & Engels always saw Kapitalismus as a necessity to even try to change the system to socialism and then as the next step real 'communism'..
Lenin, Trotzki and the other guys didn't listen and tried to reform a feudal peasnt society with little capitalism instantly to some kind of socialism/communism under a dictatorial one party rule. Marx would have never approved.
Mao showed the world why it is even more difficult to transform an ever pooer society.