I canoed on Superior over the summer. I’m just a recreational paddler with a heavy, flat bottom boat that’s easy to tip. So I canoe on sections of the lake with sandy beaches and avoid the rocks and cliffs. That way if we become swimmers it’s an easy reach to pull the swamped boat up on the beach and start over again.
The big danger of Superior is of course the low water temperature. Other challenges to paddlers are wind, swell and choppy waves.
Beyond recreational canoeing on the lake, posessing both skill and a canoe you have confidence in should be a must. That is, you and any passengers should know how to refloat a capsized canoe and get back into it quick enough to avoid hyperthermia.