DCNH is a sub-temperament theory. Why does Gulenko prefer sub-temperaments to sub-clubs? Probably because the existence of sub-temperaments is more obvious...
1.) A lot of people appear to find it difficult to determine if they are Rational or Irrational. This even caused a problem which is known as the infamous j/p-switch...
2.) Some people say they are extraverted but not outgoing. Others say they are extraverted but their energy level is low...
So does everyone agree that temperament is much harder to determine than club?