OK, I'll take up the challenge of trying to get you to actually synthesize a new view instead of trot out the standard Marxist line.
Marx may have emphasized innovation, but you didn't get that from Brezhnev and his cronies. Innovation stopped in the USSR after Khruschev, and it was run as a party oriented kleptocracy, not much different from capitalist kleptocracies. If you travel around the USSR and look for the technological advances, they pretty much stop around 1965.
How did you infer that I said chattel slaves had a better standard of living in 1850? They didn't. Any advances from 1750 to 1850, no matter what the source, are going to accrue to the upper classes first, and then only when something becomes too cheap to give away will the slaves be given the throw-aways. You see this in the modern world with shipments of used clothes to poor countries. If you go to a very poor country (say Mali or Niger), people are wearing cast-offs from the west instead of their traditional garb. It is a hook that capitalism uses to hook them into the global marketplace, part of that "all sorts of stuff to buy, and in doing so, there are jobs where you can make money to buy some of that stuff" I referred to earlier.
I think you misunderestimate me if you think I am trying to prove the "morality of capitalism". I will be the first to point out that capitalism as practiced by its most amoral invention, the corporation, is only about money. Since it is only about the money, my argument is that it should be tightly controlled, maybe even supplanted by a socialist, planned distribution for basic needs. However, I would allow it to operate freely in the area of luxuries, consumer goods, entertainment, fashion, and other things that aren't basic needs.
If you are game to consider another example of the failure of Communist central planning, consider the agricultural planning that goes on in North Korea. However you might view them as representative of Communism in total, their agricultural planning has followed a classic Communist approach with collectivization, mechanization, and chemicalization (I don't think that was a word until Kim Il Sung coined it). It's led to them being food insecure where agronomists who have studied their situation have maintained that they could still be food self-sufficient. (
http://38north.org/2010/05/why-north-korea-could-feed-itself/) It's a pretty big screw up when you cause a famine in a country where the national dish is pickled cabbage.
I'm not going to advocate or try to "prove the morality of capitalism". Neither am I going to give classic Communism or Marxism as it was practiced a pass either. I am going to look at both critically, see what works in a Utilitarian manner (the greatest good for the greatest number) and advocate for that. I think Cuba has been a good model of what works. When their inputs from the Soviet Union were cut off, similar to the North Korean situation, they responded by a wholesale change in agriculture, implementing community farming in urban areas and actually improving food availability; and that did use some free market capitalist elements.