He's certainly very systematic and absolute when it comes to creation of music, so yeah I could peg him as an INTJ. Maybe ISTJ though. They really love their systems.
Schoenberg was trying to do something very different though by acting outside already existing rules and boundaries of composition (though these have always been stretched ever since composition became a concept in its own right). His problem was that he created an entirely new method for cobbling notes together that was far more rigid and aesthetically unpleasing than what has gone before. Instead of freeing composition he bound it tightly. He did succeed in fathering a system that requires no inkling of creativity whatsoever though, and for that he may have earned the INTJ label
And yes, there are such things as INTPs who overuse emoticons
As long as they are surrounded by a great team of scientists who are able to incorporate said contraptions.......................then, sure, they should be able to spout off at the mouth all they want. But, this is very much a "hypothetical" question you pose here - because most of the time the INTP will indeed be an expert on whatever they are talking about. Your hypotheticals are really starting to turn a very straightforward, realistic thread into something that is so far out, people are going to lose interest. For the sake of our readers, please try to keep future questions in the realm of reality please. You're really "reaching" with some of these questions.
No. It's impossible for an INTP to still be an INTP.
Highly unlikely, but I hear that it does happen occasionally in some mutants.
When we're children we might dabble in science fiction, but when one becomes a man, he must focus solely on reality and real-world applications.
Question #23: Do INTPs feel the need to "Get back on track?" when a conversation is being derailed?