Quote Originally Posted by InkMyUmbrella View Post
It sounds like SEI is so common because Jung/Myers clumped people who are neurotic/have self esteem issues into this category. Not saying other types can't have issues, but they seem to manifest as Si + Fe than anything else. At least this is my theory; I could be wrong. Also there are probably naturally happy ISFps.
No, Jung is only categorizing by functions. Any personal problems are secondary and just correlations to that. Si+Fe can have very positive manifestations if the person is able to develop them. But often the demands of society are very different than then strengths of the SEI, so that creates problems. But as a pure type, the SEI is not problematic.

Successful SEIs are usually artists, because here they can get paid for using their strengths.