Could be, but it's odd that NEC would be anything less than absolutely specific about this it were indeed the gold standard.
How many twists are acceptable? What length? What strength to separate? How to properly insulate? Etc. Back to my example before, if soldered twists are permitted, then I would also be allowed to use a bolt from the junk bin and a couple washers to make a mechanical connection, so long as I soldered it.
