Of course in a rational society when millions are out of work, while other millions suffer from burnout, backache or sleep-shortage due to overlong working time, we would redistribute work in a way that allows us to produce the same amount of goods and services with a 20hour-week for everyone.
But since the capitalist economy's goal is not the satisfaction of needs, but the production of abstract wealth, this is impossible.
I'm afraid that's just laughably wrong. You can't redistribute work like that.
Also, talking about the capitalist economy's goal makes no sense. What happens in a free market is the result of agents in that market trying to satisfy their preferences. Apparently, peoples' preferences seem to be for a 40-hour work week, given the various constraints that exist.
The capitalist economy that you so despise has led to people being more satisfied now than they have ever been anywhere in human history.
PS: I'd also like to note for the record that I think Opebo overdid it this time. No one can be so stupid as to believe what he posted...
Time to go off topic:
I'd say that the existence of humanity in prehistoric times led to more contentment among the average person than this post-industrial lifestyle. The average prehistoric man actually ate a very healthy and balanced diet, was very tall, had many more hours of leisure time (obviously these were spent differently) and most important he/she had a major purpose. This primordial existence is ideal for humanity and is how it spent the majority of its time on Earth.
Not that I'd want to go back to that personally. Also the idea that our economy should be modeled after what makes us happiest is ridiculous, I'd like to think that we shouldn't determine the structure of society based off of a hedonic calculus.