I think you'll agree that the use of executive orders to effect a mandate is in itself, a sign of weakness. The true power lies in being able to pass legislation, something US presidents seem manifestly incapable of achieving on fundamental issues in the face of inter and intra-party intransigence. A Canadian PM with a majority has a greater ability to get legislation passed through imposing unity and unlike executive orders, legislation cannot just be undone as simply as it was done.