China

"We summed up our experience in building socialism over the past few decades. We had not been quite clear about what socialism is and what Marxism is. Another term for Marxism is communism. It is for the realization of communism that we have struggled for so many years. We believe in communism, and our ideal is to bring it into being. In our darkest days we were sustained by the ideal of communism. It was for the realization of this ideal that countless people laid down their lives. A communist society is one in which there is no exploitation of man by man, there is great material abundance, and the principle of “from each according to their ability, to each according to their needs” is applied. It is impossible to apply that principle without overwhelming material wealth. In order to realize communism, we have to accomplish the tasks set in the socialist stage. They are legion, but the fundamental one is to develop the productive forces so as to demonstrate the superiority of socialism over capitalism and provide the material basis for communism.

For a long time we neglected the development of the productive forces of the socialist society. From 1957 on they grew at a snail’s pace. In the countryside, after ten years — that is, in 1966 — the peasants’ income had risen only very slightly. Although peasants in some areas were better off, those in many other areas still lived in poverty. Of course, even that was progress, compared with the old days. Still, it was far from a socialist standard of living. During the “cultural revolution” things went from bad to worse." - Deng Xiaoping

https://redsails.org/reform-is-the-only-way-for-china/

The ones that bastardized socialism were the ultras, literally utopian socialists as Engels once mentioned, that turned it into a poverty cult, marxism has always put emphasis on production and developing production. The conclusion of the materialist conception of history through dialectics, known as historical materialism, is that production is the chief determinant force of development of society, it's marxism 101. These utopian socialists are idealists.