Yes but they also tend to have multiple political parties knitted together in a fragile consensus too, so marshalling large-scale changes across all of the part

Yes but they also tend to have multiple political parties knitted together in a fragile consensus too, so marshalling large-scale changes across all of the parties is pretty challenging. A coalition partner can always not just say no, but back out of the coalition! The more I study political science, the more I find that the US and the parliamentary systems actually have more in common than people think