This is OP-54(exhaust system) page 4 Figure 2, the parts provided in the kit are an AN3-4 and an AN310-3 with the instructions to safety wire the scat tube clamp.
I find the FWF the safety weak point of the kit(RV9A IO320 in my case). A lot of builder improvisation is required on clearances, routing, and techniques. I see lots of places were someone could do something wrong the could compromise the safety of the airplane. Case in point almost every time a FWF image is posted on Vansairforce people point out errors.
You have found an error that I wasn't aware of.....
If you look closely at the photo, the nut isn't an AN310. It is an all steel self locking nut. because of that, the bolt should also be called out as an AN3-4A.
As the text in Figure 2 says and as depicted in the photo, the safety wire goes around the clamp. It has nothing to do with safetying the bolt (because of the self locking steel nut).
Because the Adel clamp connection may be undone on a regular basis during maint. the safety wire is specified to hold the clamp closed which will aid in re-assemble.
As for your other comment..... These are airplanes. There is a
lot of places (not just FWF) that things can be done wrong which could cause a negative outcome.
By and large I think the majority of people that have been involved in the RV community for a long time will agree that the FWF kits had made huge improvements towards helping builders do installations that follow standard practices, in to mimic a design that is safe. I agree that there is still some education and judgement involved. It is just not possible to write a manual that contains details that will always assure the routing of a piece of scat hose will not be in contact with objects that it shouldn't be (just one example).
As for people pointing out errors..... I find that a lot of the stuff like that on VAF comes as a result of there being more than one way to do something. People have there own opinions. Just because they think something different is better or more correct, doesn't always mean that it always is. Often times it is just a different way.
That is what makes experimental aviation cool. People can do what ever they want
(though that doesn't mean that they should)