On May 5th, 1818, Karl Marx, hero of the international proletatiat, was born. His revolution of Socialist theory reverberates throughout the world carries on to this day, in increasing magnitude. Every passing day, he is vindicated. His analysis of Capitalism, development of the theory of Scientific Socialism, and advancements on dialectics to become Dialectical Materialism, have all played a key role in the past century, and have remained ever-more relevant throughout.
He didn't always rock his famous beard, when he was younger he was clean shaven!

Some significant works:
Economic & Philosophic Manuscripts of 1844
The Eighteenth Brumaire of Louis Bonaparte
The Civil War in France
Wage Labor & Capital
Wages, Price, and Profit
Critique of the Gotha Programme
Manifesto of the Communist Party (along with Engels)
The Poverty of Philosophy
And, of course, Capital Vol I-III
Interested in Marxism-Leninism, but don't know where to start? Check out my "Read Theory, Darn it!" introductory reading list!
I'm not dismissing tribal societies, I just don't think tribal organizations are suitable to modern conditions in most of the world, nor do I want to live as tribal societies do. The quality is fundamentally different, tribal production is based on hunting and gathering, Marx's conception of Communism is based on massive industry and global cooperation. The quantity and quality are different.
Tribes are perfectly capable of running industrial manufacturing supply lines in terms of administrative ability. In Australia, tribes are refuelling helicopters. They're doing it under capitalism, because white people suck, but they could just as easily do it under communism if the white people had left well enough alone and not stolen the land and enslaved generations.
I'm not making an argument based on ethnicity, but mode of production. You yourself admit that those tribal societies no longer fit what we were talking about as Hunter/Gatherer societies, but are now being swallowed by the very same Capitalist machine, in fact to greater degrees thanks to the evils of settler-colonialism.
A hunter/gatherer society cannot make a helicopter, that's just a fundamental fact. If you move onto large industry capable of creating helicopters, you are no longer in the stage of "primitive communism."
From what I can tell, they're doing the anarchist nostalgic idealization / fetishization of the past. Usually goes along with idealizing poverty, defeat, and religious "self-sacrifice", on the terms that this is more "pure" and moral than the modern day with its modern production methods, science, technology, and gasp ability to feed millions of people with labor-saving technology.
When indigenous peoples do start taking up the mantle and uplifting themselves out of poverty by industrializing (Vietnam, China, DPRK, etc), then these same anarchists denounce them for the "betrayal".
While I agree that that's the tactic drag is going for, I believe the purpose behind it is less innocent than that, drag has admitted elsewhere to intentionally trying to get banned from Lemmy.ml "while sharing leftist history." The intent is to portray the Marxist position as racist.