A commercial building recently added electrically secured locks to its' doors. The installer ran his wire through a convenient duct:
To be fair, there were all manner of structural members in the way. As literally the last contractor in this remodel, I can see why no one wanted to tear the walls apart.
Indeed, I found this when I used that very duct to get the access I needed to instal a required luminaire. I'm sure any HVAC guy would grit his teeth at the mess I made re-assembling the ductwork!
So ... do we continue to cry about the LV guys being able to get away with this - or do we recognize that the NEC is pretty much irrelevant for them?