He could have still had a removable cord but it was the $25 difference in price for the male panel mount vs. the way more common female.
I think think it would be slick to use the same concept on all the vessels as well so that you didn't need the cordset hanging off. Someone needs to start working on a line of heating elements with a molded-in male twistlock. Hmmm, beard stroke and a Dr. Evil pinky.....
Even after all the bickering he could have just said, "thanks for all your concern, it's dangerous and I'm reconsidering the design". Whether or not he would ever heed the advice is moot at that point. I've only seen one other person throw a "I'm outta here" tantrum in my whole life.