Not too long ago Democrats had superdelegates which highly influenced who the nominee would be. Then after a lot of flack about that they changed the system so primary voters had more say. Now you're saying that they should go backwards to the party picking the nominee and to hell with the voters?
Republicans still have a system whereby whoever gets the most votes wins ALL of the delegates. Trump became the nominee winning primaries with 15% of the popular vote, and getting all of the delegates. 85% of the voters wanted someone else, but Trump got all of the delegates.