Force of Will is what is not 100% Effective
Benny,Merrill may have done everything on your list, except No. 6.He apparently was not an advocate of wearing a life jacket, as you are not. He also apparently fell overboard in cold water during a split second of carelessness, and has died: his reluctance to wear some kind of flotation no doubt is a contributing factor in his death.I agree with every precaution on your list, but see no reason why a modern harness/PFD and tethering onself to the boat should not be part of a "belt and suspenders" (no pun intended) approach to single-handing.An automatically-inflating PFD with a collar that surrounds the neck is designed to keep an unconscious person afloat in a face-up position that allows breathing. And if the chances are 80:20 that it will, what possible reason can there be for not using it?My manually inflatable (but I'm thinking about going to automatic) PFD is also a harness. Uninflated, it causes no restriction to my movement, and allows me to attach myself physically to the boat (the tether must be short enough to avoid being tossed and dragged). Yes, clipping in is a small inconvenience. Falling off my boat, causing untold thousands of dollars in damages/personal injury when my unmanned boat puts people and property in its path in danger, or even dying, is a larger inconvenience.Arguing that "nothing is 100% effective," and that inflatable PFDs "may or may not work" are arguments FOR an overlapping strategy, not against one. One of the "abilities" you someday may have to rely on could be your ability to stay on the surface as long as you can: I'd rather have flotation than tire myself treading water. If it is a short distance to safety, and the PFD is hindering my swimming, I can always partially deflate the thing. And they have manual inflation tubes incase the cartridge is bad or I tire and want to rest. This assumes, of course, that I fall off because I'm not tethered, the boat gets away from me, and I can't re-board.Whatever happened to Merrill, it may have been unnecessary, had he made one change in his approach to single handing: been more humble.