Don, code doesn't mandate the home run wiring method, it mandates the use of AFCI. We've developed a product that allows contractors to continue wiring homes using the same methods they've been using, and we save them a ton of time and money. I think I'll leave it up to the contractors which they would prefer to do:
A. Use competitor A's product that requires me to change my wiring method and wire two runs of 2 conductor, or:
B. Use Cutler-Hammer's two pole AFIT, and continue to save labor by using three conductor.

Hmmm....which would you choose???