Most people are warned away from touching the trust-rod, yes you can strip the thread or snap the rod, but you "can" also win the lotto
There's no element of chance or 10 million to one odds of getting it right though ?
People are warned away to stop them doing damage, but it's hard to do damage. You have to be a real idiot - truss rods tell you when they are in distress
. Common sense should let anyone know something's not right when you need a torque wrench to tighten the rod or it makes horrible screeching noises.
The biggest problem with truss rods is people trying to "set the action" by overtightening them - and that's just a case of educating them. If you're taking the time to tell them to stay away from the truss rod, you might as well use the time to tell them what a truss rod is for and how to set it. No, I suspect it's often a case of "It takes specialised knowledge, so you will pay me R350 an hour to do it for you"