I think in that particular case with the carabineer and mainsheet setup, in moderate conditions, the boat would have rounded up and flipped, saving his event. I think it should be left to the sailor's discretion to use a tether-like setup or not. Sometimes I'd want to have that second chance to get back to the boat (I used something like that on the 4.3 for distance racing) and other times I can see offshore Tybee/Worrell sailors (one of which I am not) absolutely not wanting to be secured to a cartwheeling boat that is tumbling downwind in a whiteout squall. That's why there are locator beacons and strobes on every sailor and not attached to the boat.