Well, this is one issue that simply is never going to go away.
Most 'teks' screws have threads that, IMO, are close enough to 'machine screw threads' to count. If you're also talking 'silver bullets,' then they even have something that approaches a binding head.
I am still more than a little PO'd about the way horses were changed in mid-stream, a la AFCI's. To justify this 'no sheet metal screw' nonsense, a certain 'code authority' circulated all manner of pictures showing obviously loose, inappropriate, ordinary screws going into oversize holes.
Once the code came out, this same person went on a crusade against the lowly 'teks' screw, even when properly installed. Thus began this debate.
Greg ... engineering analysis aside ... I'd be happy when the fastener is tight, and used as intended. As long as the metal of the wire is held tight against the metal of the box, I'm not going to lose any sleep.
