I'll bite. Until we have machines doing most things, communism is unlikely to work, especially in post agrarian societies. We need to first fully realize not just post scarcity, but post work. In theory it seems like things like anarcho syndicalism and basic communism should work, but I don't think they really function at a large scale. Socialized democracy and worker owned cooperatives within a capitalism system gets the closest to solving the problems imo. I like the idea of anarcho syndicalism the most, but I just don't see how it can survive in todays world.

With all systems the same problems crop up. Powerful people seek to exploit ANY system to their benefit, and unmotivated people seek to do the least to get by. Who cleans toilets in a equitable communist country, who picks up the trash? Do we force people into job roles to fill the need? Without economic incentives I don't see how the system stays healthy. Removing class barriers to some jobs does not always make them desirable enough to fill the need. Capitalisms structure inherently results in people that are strongly incentivized into those roles, because the wage will usually rise to meet the demand for employees. (Low educated citizens seeing opportunity in jobs that make a living wage.)

Currently the biggest problem we have, imo, is really that people with power expend tremendous resources on controlling the flow of information, and that has left a lot of people very misinformed. No matter the system, those same people will be fooled into voting for things that benefit the powerful to the detriment of the rest of us. That's not so much a capitalism problem, but an information problem. That's a problem we have no solution for. It has been an issue with humans since civilization has existed. We can't individually know everything, so we rely on others to fill in the gaps in our thinking and assumptions, and many of those people have a motive to only give you the information that benefits them, or worse off just lie. A lot of peoples anger towards capitalism, is a result of unbridled capitalism in a world where most people have incomplete information to make good decisions at the voting booth. We only have unbridled capitalism because of misinformation, not because capitalism is inherently bad.