Toller wrote:

If you have to wrap your devices, you are doing something seriously wrong.
But if it makes you feel better...
shrug It's not a necessity, but when I'm working with a bunch of 12/2
or 12/3 wire in a tiny box that's 40 years old and designed for 2 wire
electrical, I'm going to take every preventative step I can.

It seems like a solid idea to me, doesn't cost much, doesn't add much
time to the job, and helps keep things apart from each other. I've done
it both ways and neither have failed me yet.