It looks like Tesla provides both 6-50 and 14-50 adapters for the chargers. As I look for how to prepare for my Model S, I'm wondering why they seem to strongly recommend the 14-50 over the 6-50 for new installations. Is it just for compatibility reasons with other devices/future vehicles? The Model S does not use the neutral, and I'm looking at using 6 AWG MC (armored flex conduit) to put in my run. The 6/3 is twice as expensive as the 6/2 cable, so would be nice to save on the cost. I definitely plan on getting a 14-50 adapter for use in campgrounds, etc., but at home I'm wondering why I would need to run the extra wire for a 14-50?