That is going to be my theme this year, simply put- Wear it or Chances are you will die without it. While we all may be good swimmers, an accident can knock you out & when you come to, if you do, may be too late.
When I fell out of my sister's Porta-Bote, I had mine on, a spare in the boat & two seat life cushions. And how I fell, was out one side backwards. My legs were still in the boat, but I was caught offguard & I bobbed back up fast due to my lifejacket being on. Had I not had it on, it would have been harder to unlock my legs out & off the boat.