The underlying reality is that types(socionics, mbti, enneagram, etc) aren't everything, only part. Between it all are the shades of gray that have little purpose except to demonstrate that we our more random and unpredictable than what can be explained through types. It is a layer of flesk that masks what many would consider the unappealing aspects. There are more than 16 types, but too much more becomes tedious for our minds to comfortably handle. The more numerous just approaches individuality and no longer becomes relevant for discussion.