"Here is an idea: require all laws to be single subject, single focus." The problem is that this goes against a parliament's ability to make deals. Each party

"Here is an idea: require all laws to be single subject, single focus." The problem is that this goes against a parliament's ability to make deals. Each party has its own priorities, and is willing to compromise on other issues to advance these priorities. Putting unrelated laws in one bill is essentially a way of formalizing a compromise so that congress can vote on it (with time a complexifying factor that can serve both sides depending on the situation). Do you really want to take this away?