If Congress transitions to a two-year biennial budget it will give lawmakers more time for oversight and bring greater transparency to the budgeting and appropriations process. The switch could reduce the likelihood of government shutdowns.
Congress is going to be inefficient and dysfunctional whether they prepare the federal budget two years at a time or not. Not only that, but it is hard to forecast how much tax revenue will be available two years in advance and how it should be spent.