as an INxP i am very curious about this. i've tested as both and i don't really know which type i identify better. i'm also not a very strong I, so that probably also affects my personality. i have always been introverted, though, more as a child than now, i think, because i've had to adjust. it is an E world out there, really... at least i was always pushed to be more extroverted.
anyway... do all INFPs have strong Ni and Fi?
because i think that's where i probably am more INTP than INFP... especially the Fi part... even though i've gotten better at that over the years... my Fe is dominant, though, i think.
then again... i am very sensitive, really... i just have this logical "armor" i usually use... but when i let myself go, i can get very lost in feeling and stuff that i logically just let be can make me deeply emotional.