Thats all well and good, but goes against other things like running romex outdoors up in an eve of a home, or in pipe. This isn't legal because of damp locations, which is nothing compared to the underground J-box with no bottom and splices made.
Guess thats one of those code issues that'll never be really clear.
Also, years ago we use to run romex in residential garages, in open studs, and it was legal, the inspectors passed it always. Maybe that code changed by now.
