You think voting on Roe vs Wade would solve it? Not a snowball chance in hell. Republic is there to make it so that wishes of different parts of the state that do not align at all do not rip the state to pieces and lead to a civil war. Governing by simple majority in long term never worked and never will.
Everyone likes to talk about will of the people. Well here is news. Different people have different desires, in different regions of the country majority wants to do different things. Only way to keep lid on this without the whole thing blowing up is to have representation of the this and slow the process down as much as possible, quick changes are the most disruptive/dangerous.