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What's important is the outputs of society, not the accounting that occurs between effort and consumption.
There are marked differences in styles of consumption. Some of the things the Romans did, for example, are simply too destructive and wasteful for our tastes today.
If you’re saying, we can allocate capital not to more or less able people, but in some other way — to institutions or something — well, that’s true; but there still will be capital managed by individuals. When talented, constructive people rise to the top of the heap and run laundromats, computer companies, and other businesses, we are ultimately all better off for it, because those services are (a) available and (b) good. But to run such businesses people do need to accumulate capital.
When accumulation of wealth is more tightly coupled with the ability to invest rather than the ability to let compound safe investments create wealth you increase efficiency.
Beyond that I don't think capital accumulation needs any incentives. People don't invest more because of changes to the tax code they simply get more money from the same investments.