How does economics bend over backwards to hide the “fundamental theorem”? Every intro to macroeconomics basically starts with a simplified conceptualisation of

How does economics bend over backwards to hide the “fundamental theorem”? Every intro to macroeconomics basically starts with a simplified conceptualisation of production as a function of labour and capital. Then it describes returns to labor and capital and so on. People who own capital get paid for that capital. It’s quite literally Economics 101.