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> none of the components had sovereignty over the state they needed to do their job independently. It's just components micro-managing components all the way down.

Isn't one of the tenants of FP that nothing is mutable anywhere?

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Correct, technically they pass copies of the state; which gets cloned at every component/module/function boundary. This protects you from 'spooky action at a distance' which is a real problem which can happen when mutable state is shared by different components but FP can introduce other issues related to passing around a lot of state which can become outdated as it traverses the many layers of spaghetti code.

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