Consider this: modern capitalism was pretty much inconceivable to people living in the feudal era. In the same way, it is possible that the system we need is inconceivable to us at the moment. Critiquing capitalism and advocating for a move away from it is still useful.

There are plenty of things that haven't been tried aside from small-scale examples:

• An economy based on worker cooperatives
• Universal Basic Income
• Universal Basic Capital
• 'Library economics' or 'Library Socialism'

It is a jab at capitalism. But the theory as the funny beard man stated it would be an evolution of capitalism. Capitalism was very good at making technological progress, advancing productive capacity immensely. His critique is that all that progress wasn't used to make people's lives better.

The major iterations of communism that everyone points to didn't start with fully industrialized societies. They were predominantly agrarian societies coming out of a monarchy, that were pushed through industrialization very rapidly and were left extremely unstable and subject to extreme authoritarianism.

Socialism is probably the most realistic solution that's been "half tried" (and yes there's a difference between socialism and communism, the right just doesn't want people to know it because they might start thinking there's a viable alternative)... State run non profit corporations for all essential needs, capitalism for things that aren't essential. We went as far as creating some state run corporations, some of them non profit, but we never moved far enough in that direction to truly see how beneficial it can be for the masses to not have to enrich investors when buying food or clothing or renting an apartment...