I know of at least one (significant player) EC that does not ship 12-2 to commercial jobs.
They, by policy, run only 12-3.(!)
This solves the need for the occasional extra ciruit in a stud wall. It bails them out of partially damaged cables -- a constant bane with the hacks out my way.
It also permits much dumber/ greener troops. Cable becomes just cable. There's no way they can install the wrong stuff.
The way they build up their D&B circuits drives everything towards 12-3 -- as against 12-4, which they shun.
If the job warrants, this rule is broken. (large tight bid)
It also permits them to stay 'on color' -- in the main. C phase loads are shifted to as many piped runs as possible, particularly back near the panel. Staying mostly on color makes circuit de-bug much quicker. Green troops are normally confounded by the idea of phases -- no matter how slow the instructer goes. They have to do it with their hands and over time finally pick it up. (Or maybe not)
