This is a typology forum, and people tend to become more educated as they read different Jungian analysts, like Beebe, and other theorists like Keirsey.
As people are better educated - and even more, become honest with themselves and discover themselves, that's part of it too...some people originally type themselves by what they think they "should" be rather than by what they actually are.
According to several theorists ESFP makes nearly equal sense for me as ENFP.
So I'd thought I'd be an ESFP this week.
"Sentiment without action is the ruin of the soul." - Edward Abbey