Nord Lock - It's Gitchy
How long has safety wire been around? I don't know, but I can say that I've cut .032" safety wire in 2014 that was installed in 1956.
Safety wire is cheap and it's got a really really long shelf life and it fits a lot of things.
No safety wire I've ever installed has failed - never.
Safety wire comes in stainless, monel, and inconnel (at least)
I don't really need to "check the torque" of something I've saftied.
Safetying a Hartzell CS prop with .041" takes 10 minutes tops.
You ever try to break .041" by turning the bolt?
If I drop a can of safety wire on the ground, I can easily find it within a couple of minutes.
.041" safety wire will go through the tip of your thumb with no problem (lets see a Nord Lock do that)
Safety Cable is an option to safety wire and it's that much quicker.
Most of all Safety Wire Just Looks Cool (when it's done right)