Democracy for workers begins and ends at the ballot box; it comes and goes in a moment. For the bourgeoisie and capital, it remains an unchallenged, continuous process with hardly a temporal break.
Democracy for workers isn't a process that grants us the ability to interact with our material world at every stage of development and guide it to conditions favorable to us. Democracy for the bourgeoisie exists in precisely this manner, that is why they can achieve what they want.