I always did wonder why all the differences in how people present themselves to the environment.
I/E seems satisfactorily explained by the level of physical/neural stimulation needed to create the same impact.
(Introverts are more sensitive to stimulation.)
But the T/F thing?
Why for some people do they instinctively need to balance everything out outside of them and ignore the inner feeling/preference state as irrelevant, while for others, being fully aware of that inner values/feeling state is essential and inseparatable from how they choose to act and live? It's not just a preference, it's a preference because to not follow it can lead to feelings of discomfort and anxiety.
T's seem secure in their detachment, but that is because when they become attached in a very personal and direct way, it leaves them uncomfortable. There is some benefit derived internally, in terms of anxiety and security level, in removing oneself from the middle of that valuing process.