When you elect a government in a modern so-called democracy you are in fact electing a monarch and their court. The court will consist of elected officials- who are answerable for their actions, unelected officials who are less so, obscenely wealthy godfathers and godmothers who need to be heeded and appeased or else- and a mixed bag of family members, cronies, lovers, flatterers, creeps, gophers and people who know where the bodies are buried- almost all of them hungry for power. A strong monarch may be able to keep this circus in some sort of order; a weak one- which is what Boris Johnson appears to be- will be pulled every which-a-way.
Come election time all the court wants you to see is the smiley face of the monarch- and the less you see of anybody else the better. But once the votes are in it may well be the anybody elses who get to run the show.