It's probably important to say that typology is not MBTI.
Typology is a classification according to general type. You have typology of archaeology, literature, geology, psychology and other social sciences.
Typology is used here as shorthand for MBTI. This is called special pleading.
And MBTI needs special pleading because it cannot stand on its own two feet.
We should realise we are lucky to belong to a site with such a general heading that allows the discussion of almost anything.