Capital doesn't maximize capital; it maximizes productivity. In absence of controls, capital naturally flows to productivity in order to be maximized by the holders of capital; but only because productivity creates wealth, not the capital itself.
Labour productivity, by economic definition, is the ratio of output to people. If most of the wealth generation in an organization is automated, labour productivity will be high, whereas if most of it is manual, labour productivity will be low, even when both organizations are producing the same amount of wealth.
Does it? For whom does productivity create wealth for?
Productivity is about getting set results based on the smallest set of resources (time, money, materials, etc...). It does not include anything about wealth, nor where that wealth is distributed to, or whether resources could have generated more wealth used in a different way. It's actually possible for increased productivity to decrease wealth.
Now, to your point, the fruits of productivity could be unfairly captured by non-producers, in which case wealth is being misappropriated from those who created it to those who have the power through whatever form to capture it (i.e., taxes, feudal land ownership, etc).