I think you have it backwards.
Communism is our past, as all primitive tribes always are communist inherently.
They could not survive or flourish if capitalist.
But it is not clear communism works in really large societies, where people are all strangers to each other.
In Marxism, there are two types of communism. Primitive communism and high communism. As you said, when we were hunter-gatherers, we organized our labor in primitive conditions, materially and otherwise, hence we identify that form of communism as "primitive":
Communism (from Latin communis, 'common, universal')[1][2] is a far-left[3][4][5] philosophical, social, political, and economic ideology and movement whose goal is the establishment of a communist society, namely a socioeconomic order based on the idea of common ownership of the means of production, distribution, and exchange—allocating products to everyone in the society.[6][7][8] It also involves the absence of social classes, money,[9] and the state.[10][11][12]
en.wikipedia.org
Communism (whether primitive or high/advanced) according to Marx is a
stateless society, without socioeconomic classes or the need for money. Before large-scale agriculture, which led to private land ownership and slavery, feudalism..etc, there was no need for a state apparatus. The state was created to protect the private property (land, slave ownership, livestock) of the ruling class (the socioeconomic class of owners). The objective of Marxists is high communism, which is a stateless society, without socioeconomic classes or the need for money, and that can only occur in the modern age, with very advanced technology. Socialism is the process that leads to
HIGH-COMMUNISM:
Hightech communism is the result of a process of socializing, democratizing, and eventually completely personalizing production. That process is commonly known as "socialism". When capitalists compete for greater market share, they develop new and more efficient means of production in order to reduce overhead, increase profits and dominate markets. This competition between capitalists results in an explosion of technology, that facilitates more efficient and effective systems of production leading to a significant reduction in human labor. However, this process of productive evolution eventually leads to the necessary adoption of a mode of production that discards the pursuit of profits and the use of markets. Why?
If capitalists (the ruling, wealthy class/ownership class) are the pillars of society, then the working class (those who must sell their labor/lives to the capitalists for a wage) are the foundation upon which the pillars rest (wage labor = the paying consumer/market). When technology significantly reduces the need for wage labor, it creates mass unemployment, consumer debt, and a catastrophic, life or death crisis:
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Some capitalists will offer consumers a UBI i.e. Universal Basic Income or just a Universal Income (not basic, but a full $3000 monthly income), essentially in order to place capitalism on life support. The government plutocracies of the world, especially in the West, are being told by their wealthiest ruling classes (the 1%), that the only way to avoid mass unemployment and the pitchforks coming out (bloodshed), is if these governments hand everyone a "free check"/"free money", in order to conjure up an artificial market, with paying consumers. But that's not the actual, long-term solution. That's a mere bandaid that will lead to a worse crisis in the future, because that will only create a modern, techno-feudal society, with the current wealthy ruling class, owning all of the technology and everything else, while the former working-class will be consigned to serfdom if not the compost heap.
Socialism is the process of converting capitalist, privately owned, profit-oriented production, into a publicly owned, non-profit, socialized, democratized, and eventually, completely personalized system of production, also known as "High Communism"/High-Tech Communism. So we begin with collective socialist ownership of the means of production where the working class collectively as a community, takes the reins of power and ownership over the capitalist state and all of the machinery and facilities of production from the capitalists, to meet the needs of 95% of the population (the working-class) and everyone else, including the former capitalists (meeting their consumption needs as well).
Automated Systems, Robotics, Artificial Intelligence, Autonomous Machines, Self-Driving Vehicles, Supercomputers, Nanotech, and more...
We own all of the above technology collectively and we organize production to meet our needs, eventually reaching the material conditions of high communism when we no longer need anyone else to produce what we consume. When the individual consumer has complete personal autonomy over the production of goods that they consume, the state becomes superfluous and all relations between adult human beings become 100% consensual, without coercion. Atomic precision manufacturing machines will eventually provide this level of freedom to the individual consumer.