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 di

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by different components but FP can introduce other issues related to passing around a lot of state which can become outdated as it traverses the many layers of spaghetti code.