So you mean that the executive decision authority and responsibility does not exist? I think it does exist.
If tomorrow in wartime a crucial decision like deployment of nuclear submarine has to be done, would you like it to be done by an extraconstitutional authority? Or by a prime minister elected by popular vote?
How is that any different from foreign rule? Might as well let the British make the decisions for us, right?
What is the purpose of voting and election then? May be communist regime regime would be suitable? Even they have a good grass roots election.
How do you hold the party accountable?