Watch your language!
The "White Book" has a few problems. First off, it's not 'law;' it's just a handy reference.
More important, UL will usually say something has "not been evaluated for ..." This does NOT mean such a use is banned - it's only UL's way of saying 'we don't know.'
Likewise, devices are evaluated for only ONE 'pass through." I've seen receptacles with a wire landed under every screw - another situation 'not evaluated for.'
Devices ARE tested with stranded wire - the 'normal' stranded, that is. If one of UL's drones can make a good connection, there's no reason you and I cannot.
It's true that various crimp connectors will not fit onto receptacle screws without some trimming. That's a problem, from a 'listing' angle. There's also a problem fitting the attached lugs into boxes, without bending the dickens out of them.
All told, the 'wire wrapped around the screw' way of landing the wires is a poor one, and I'd much rather have pressure plates. For that matter, I'd much prefer that solid wire be used.
