As for Marx, and why I assert his ideation is unfeasible:
His premise starts from the idea that it is possible to immediately jump from a poorly educated population with little familiarity with automation, automation processes, or in how the energy-economics of largescale production and distribution of products differs from small scale.
It is not. Artisinal, small scale production is a fundamentally different animal from largescale mass manufacture.
It is not possible to just hand people skills.
People who have such skills, want to be compensated for the time and energy needed to attain them. Even in our capitalist system, this is a fundamental problem. Wages do not, have not, and likely will continue to not, have parity with schooling costs required to produce the requisite labor pool. This is fundamentally why 'college debt' is the societal burden it is. I am mostly pointing out here, that the cost to resolve this is not insignificant. You dont get there 'through revolution.'
Additionally, since this disparity in knowledge, and thus ability, is *so large*, and *has such a large impact*, the maxim afforded does not work, as a functional system. (There are too many with needs, and not enough with means)
Which then comes to the last leg, where he proposes a system that is uniformly classless, and where everyone has full and equal access to all resources, and none have greater access.
Due to the prior mentiomed problem, there develops a foundational need by the resulting civic order to compel those who can provide, to do so, without any real compensation.
This in turn, *creates* a favored 'enforcement class', which is directly at odds with the foundational premise.
For marx's communism to work, you need magically ideal humans.
Magically ideal humans *do not exist*.