This would make government shutdowns over budgets a thing of the past, forcing both parties’ leadership to aggressively seek timely passage of appropriations bills under regular order to achieve funding and policy objectives. It'd be a strong incentive for constructive compromise involving a majority of Congress.
Funding the federal government at the previously-enacted level without regard for changing policy needs or individual programs’ value wastes taxpayer dollars by ignoring hundreds of hours of consideration and program evaluation incorporated into each federal agency’s budget submission.