The state is part of the superstructure that is shaped by the economic base, which is in turned maintained by said superstructure. However, changes in the superstructure are never transformative unless they also come with radical change to the mode of production. Billionaires, and the capitalist class as a whole, completely block the path for the workers to seize the means and reshape society towards progress. It doesn't matter what faffing idiot you put in power in the state, when the economic base keeps operating with the same logic of capitalist extraction.