“Workers should have a greater share of their surplus value” is textbook Marxism. The idea of a “living wage” is tied back to the goal of de-fetishizing commodities. You want to recognize that stuff comes from people and pay them enough to exist in the world you’ve built. You don’t want at team of workers producing a commodity (for instance, winter coats) in such a way that certain individuals in the manufacturing chain can’t afford to live near the factory or purchase the output.