This is for the purpose of drawing comparisons between them and other MoP changes, like capitalism->socialism. This comparison could be useful for refuting the claim that the decades-long M-L state efforts to transition the MoP are a sign of failed revolution or capitalist corruption (e.g. “it’s been [x] years and china hasn’t established a worker’s utopia yet!”)[1].
Also recommending principles of communism though it’s super short and succinct, but it is still information about it. And the ussrs political economy textbook, also available on the MIA