Do I have to follow the instructions on the wirenut bag in order to maintain the UL listing of the nut? If I use a method that differs from the printed instructions, doesn't that void the items listing? If not, then why not?

It seems that a good percentage of the questions asked on these forums receives an answer resembling "follow the supplied instructions for a proper installation". Why are wirenuts not treated the same?

I always pre-twist solid conductors with a linesman’s. However, since I have yet to find a single wirenut package that describes using the solid-conductor pre-twist method, I just assumed I was voiding the UL listing. Pre-twisting worked so well I didn't care if it was wrong!

So why are wirenuts different than most (every?) other listed device? Why am I allowed to disregard the supplied instructions and make up my own method?