I totally see how insurance and liability is going to drive this boat. But like @kyler1945 said. There is so many things that can go wrong once you leave the ground. How many components are you counting on to keep yourself safe off the ground. Your rope, your saddle, you prussic or other device holding you up, your strap around the tree for your platform or steps. The saddle only needs to take the real abuse should one of those fail. At that point your counting on it to do it's job.I am unsure how the new standard reads but the old ANSI standard stated that unless otherwise specified by the manufacturer, all harnesses should be retired upon completion of 5 years of service. The standard was A10 that dealt with construction and demolition of a fall arrest harness. I’ve heard newer additions have been updated to say harnesses can be used as long as they are inspected by a qualified person and deemed fit for use. As recreational use harnesses manufacturers will not be able to make you take it to a certified harness and sling inspection company so regardless as recreational use goes, all manufacturers will say 5 years or less. It doesn’t mean you have to get rid of it at the 5 year mark. It means if you use it beyond that point and something happens, the liability is off of the manufacturer. Insurance companies will require it. TMA requires it and I have a feeling it will be included in the finished version of saddle standards that is coming out very soon.
Your only as strong as your weakest link. Which probably more than not is the body its self. Human error will result in probably 99.9% of the accidents. Not faulty equipment, or over aged equipment. Dont wait until year 5 to inspect your saddle for any signs of failure. Check your other gear as well, and don't let your self get in the fall situation. If anything is questionable. Replace it.