The antithesis of presidentialism is pr

We can define presidentialism to mean government with all the power being controlled by a single person. This is the result we find (and expect) in a mayoral election... clearly all the power here is given to just one person but we also find it in a fptp election where the parties dominate. Whether or not we elect a libertarian president we still must follow their laws. With pr there is no president and so it is easier for the country to reject bad laws. With a presidential system we rely on the leader to reject bad laws but with pr we can do it ourselves. With pr there is no leader and so it is a form of anarchy.