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I believe this is what happened:
2008 Tesla offers Roadster, there is no standard plug design, they design one that is AC charging only. It's early and rare.
2012 Tesla offers Model S develops standard design that can use AC or DC, offers design to world as possible universal design, says if they use it they must participate in the Tesla charging network.
World decides Tesla is A) a competitor to their own car markets and B) may not be long for the world, and everybody wants their own charging network, develops their own standards.
Japan develops the J-1772 for AC charging and the CHAdeMO for DC charging.
The EU, with Audi BMW GM Ford Daimler and VW all participating, says feh and decides on the CCS standard which supports both AC and DC.
So other manufactures wind up with their own "standards".
NEMA 14-50 is previous US standard for high voltage 50 amp circuits (A dryer plug is actually a NEMA 14-30, unless your house is older and has a NEMA 11-30). A Tesla Wall Charger for the home is plugged into a NEMA 14-50 if there is one. We might ask LJ what type of plug his electrician put in for the new heater.
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