they were both geniuses they were just different personalities. auxilary te vs auxilary fe
nietzsche got new information from what practically works and jung got it from how other people felt about things
partly why I think nietzsche is an extremely practical philosopher (and his hatred of academics, people who just read books/don't do things) and jung's like fundamental view of everything was rooted in shared fundamental archetypes where his view of his own mind came from other people's values and concerns in myth and dreams