Hint: If you twist the stranded wire CCW before terminating under a screw, the strands tend to tighten as you terminate instead of splaying out from under the screw.
Now I suppose you're going to come back with something that says twisting the wire CCW is altering the manufactures design and should be a code violation??
I hope you don't fail inspections because of your opinion. Just because something is done in a manner you don't like, doesn't necessarily mean it's a code violation.
As to the bolded part of your quote, I say "not necessarily". If you leave the wire long enough, you can fold it into the box in such a way that will prevent movement from affecting the ground screw termination when you install or remove the device.
And in the case where you have multiple cables entering the box (requiring pigtails), wrapping one of the grounds around the ground screw and then taking it to the connection point results in having one less wire under the wirenut. That could be the difference between having to use a red wire nut or a blue wire nut. I don't like having to use a blue wire nut in an outlet box. :happysad: