YB-

I wear a wetsuit all the time on Superior, even when it was roasting out.  Have practiced wet exits/entries and executed countless rolls, with a fully loaded boat, in cold water, in big waves. Effective selfrescue(ideally rolling) is a must, hypothermia happens easy in 50deg water.  Rolling is a lot easier than a wet entry, believe it or not, it's easy to learn and kind of fun.   In all my many miles of yaking, smooth as glass to 5-7 feet, I have never been turned over accidently. As close as I have come is high waves, with high wind gusts, really have to concentrate on technique, and feel the water.