If you can find something safer than what ANSI advises, I'm not gonna say no. The standards have offered this option in some situations like Z133.1-2000, pg. 11, 7.2.8 - "Arborists shall use a second point of attachment (work-positioning lanyard or double-crotched rope) when operating a chain saw in a tree, unless the employer demonstrates that a greater hazard is posed by using a second point of attachment while operating chain saws in that particular situation." Good luck proving that after someone falls to their death from cutting through just one lanyard on a spar. Guess what, you're more than likely going to be paying out for that.
I've been right next to someone as they fell out of a tree. I've nicked (get it), scratched, bonked, and bruised myself in a tree. I've followed many tragic arborist death and injury news stories. What could have prevented many, many, many of them was close or closer adherence to the ANSI standard. You know, I really don't care how long you've been climbing wrong. It takes a fraction of a second to screw up. It takes slightly longer for you to hit the ground. It takes a much longer time to wish you had done things differently.
You're talking to someone who watches and works with people who do things wrong. I do things wrong all the time. Hey, I plugged the chipper before 9am this morning. But commit to an attitude of learning, please.
BigJohn, please buy the standard this week. Sean can hook you up. Kowens, I think you're on the right track. Rocky, show some squirrel nuts and give a name of who on the ANSI committee is unqualified to be there. Name one person.
ANSI isn't a person or an organization; it's us. It legitimizes our existence, and it's the key to our business success and our literal survival.