Jake and all,
I have always used a harness and a strap to the appropriate attachment point on the boat, which varies. Nowdays the length is the study point for planers and soon to foil guys. I have not been in a serious offshore race, since the seventies, and not found the time to break out the harness line and hook on if the need be.
I told Bob Hodges the secret lies in the line, "trapeze wires may be synthetic."... means modern tethers may be much lighter and stronger than the old style Forespars with the heavy shackles and strapping - very bulky to wear on deck, but I was always glad to have it when changing sails during a storm at night, offshore.
The jury is out on this until Randy, a member of our safety committee, returns from Hawaii. He will know the latest and wisest course to take.
I have never used a tether on a catamaran because I firmly held the sheets, but with synthetics and safe knives - why not? We just need to find the magic length for the trimarans and catamarans. Tea bagging at night ain't fun, but swimming alone with a PFD, tracking device, and strobe may not be preferred as well. Our boats do not sink, so I say we stay hooked in when necessary, and stow the tether when not in use. Just have one on!!! I used my foul weather gear pockets to hide mine from my feet and hands.
The safety committee will issue an announcement after Randy gets back.