That's not entirely true. OSHA does allow waist belts as positioning devices only.

You are allowed up to 25' on a fixed ladder without fall protection if you use a positioning device such as a waist belt and a rebar chain assembly that restricts a fall within 2'. You are correct by stating OSHA does not allow waist belts as fall protection.

I often wonder why nobody has come up with a positioning device as an alternative to full body harnesss'. They would be easier to climb with and would not be in your way of shooting since it would be connected at your waist. In the event of a fall, your fall would be limited to 2'. This force exerted from a 2' fall would not be enough to cause any harm. Plus you would only fall down 2', would would still be able to grab your stand and pull yourself back up or shimmy down the tree.

Fall arrest full body systems are not the answer to hunt with if you ask me. They are bulky and awkward which could cause you to fall. They are in the way, which could cause you to miss or make a bad shot on an animal. But they are better than nothing.