Jaguar about if some enfps can really use Fe or not. I do know we can use Te to memorize social patterns to a certain extent and that, since we are motivated by Fi to (mostly) be kind, we try to behave reasonably. However perhaps if Nardi strapped his EEG on so/sx enfps, he'd find they really are utilizing some of the parts of thier brains that the FJs do. I really dont know.
I have no Fe filter, personally, so often I do exactly what you say-say nothing. Thus the introverted apperance.