In my view, the biggest problem with discussions like this is that most people really don't get what capitalists do. But anyone who's been heavily involved in trying to run a command economy gets a crash course.
I recall, back in the nineties, attending a presentation by an ex-Soviet bureaucrat discussing just this issue. He highlighted how incredibly difficult it is to efficiently allocate labor and resources across a large, diverse nation. Top-down management of such a thing just doesn't work. Adequately supplying people with the goods and services they want, requires decentralized systems that can tightly monitor consumer demand. Pursuing this goal generally points to a distributed system of individual resource 'managers', who are tasked with maximizing consumer satisfaction.
Naturally, you want the most skilled of these 'managers' to handle the bulk of the resources, so a system that allocates more resources to the 'managers' who most successfully allocate their resources makes the most sense.
i won't belabor the point further, as I'm sure you see where this is headed. In a free market, we call these managers 'capitalists'. They are in charge of allocating labor and resources in society to meet the needs and wants of consumers. We channel more of our resources to those who do this successfully, in the form of profits, and deny them to those who fail, in the form of losses.
I think a lot of people make the mistake of assigning moral value to this allocation, assuming that wealth "ought" to go to the most virtuous people, and be denied to those we find repugnant. But in reality, it's all about how efficiently they use their wealth. If they make good calls and allocate it usefully, we want them handling more of our money. It's not a question of providing them with a privileged lifestyle, it's about giving them more power to allocate more resources, because they've proven they can do it well.
According to the statistics given in the OP video, capitalism has been a gross failure at allocating resources.
On the other hand, for the average Soviet citizen, communism worked very well at allocating resources. Nobody was wealthy, but everyone had food, housing, education, employment, medical care and retirement.
What the Soviet System lacked was innovation, personal freedom and personal wealth.
In our capitalist system the vast majority do not have personal freedom or wealth. The freedoms protected from government encroachment are often taking away by the economic system.
That leaves innovation as the one benefit in a capitalist society.
So we get cell phones & Hollywood. But with those we also get joblessness, homelessness, outrageously priced education, lack of retirement, and hunger for millions of Americans.