Do you think that the sailors in a W1k/T500 race should be required to be tethered to the boat?
I can't go back and change my vote, even though the question has changed.
My answer to the present question, "Do you think that the sailors in a W1k/T500 race should be required to be tethered to the boat" is "no, I don't think that long distance racing contestants be required to do such a thing."
I require myself to tether to the boat when I am sailing distance ocean sailing and I always encourage my crew to do the same.
I've been in some situations where it did matter. If the worst had happened, then you'd all be saying how stupid it was of me to tie myself to the boat. As it is, I saved myself and helped to save my boat from being pounded by waves against big rocks.
It could go either way and that is why a sailor deserves to make his own decision. My experience in the conditions that I have sailed in will show that I should stay tethered. I can't speak for those sailing in different areas where the conditions differ from my local conditions.
I sail alone in the ocean, ... a lot! I wouldn't dare let that boat get away from me. Falling off unexpectedly, is exactly when that can happen. I have had some very close calls that could have ended up with me floating along on my PFD, miles from shore.
You should, at the least, keep a death grip on the main sheet. Insisting on not becoming separated from the boat has saved me from a 5-mile swim in 64ºF water a few times. (see DUMB butt maneuver, the Dragging Under My Boat, Automatic Sheeting System maneuver)
Think through all of the possible scenarios that you can envision, imagine. Find a way to deal with every scenario and be prepared to deal with all of those potential situations. Carry two knives, a VHF radio, a whistle, a mirror, and a flare or two. Don't forget a bottle of water too.
Two knives? Yes, carry one that is easy to get to and consider the fact that it will probably be gone because those easy to get to places are also "easy to get knocked off and go overboard places."
Carry a reliable back-up self rescue knife in a place where the water and wind won't steal it yet, a place where you can absolutely get it when you are all pumped up on fear-hormones.
Being an experienced underwater sportsman can be a good asset to have when it comes to self rescue from an open-water catamaran accident. Go do some body-surfing, scuba diving (NAUI 1972), skin diving, salvage diving, or other underwater sports or work that will train you to find your way out of an underwater tangle.
Being tied up in a surging kelp forest can be a very rewarding experience; particularly if you learn to escape without using a knife. Slow the panic and expedite the recovery! Get away smoothly without drowning.
Being tangled in rope, go for your knife as you find a way to get back to the surface and/or slither out of a tangle.
Yes, I do connect to the boat. You may or may not choose to do so. Think about what happens next and be ready to face the consequences of 'not wearing the tether' and also, those consequences of wearing it.
Don't be caught off-guard; have a survival game plan already in mind.
GARY