whatever, this is for a movie armor so the comic lore means nothing to me in this context. especially when it comes to separating elements from the two, and most of all when its so loosely based on the comics, like in this case. If you choose to believe prehensile and extremis are the same, thats up to you... but it is definitly not the same thing at all in the MCU whether you want to believe it or not, and that's what matters to me. It will never be refereed to as extremis anything in the movie, so your explanations that it's the same are just ridiculous.
Also putting the word "right" in quotes as if to quote/talk down to me only works when I used that word, which I didn't... I said I wasn't wrong, and when referring to the movie, i'm not. If mixing elements from comics to the movies based on loose interpretations makes you feel smarter than others, more power to you. With that kind of ass-backwards logic, I might as well start calling comic book Killian the Mandarin.