1st point: When we hear that Fe types "create emotional charge" in others, this is not wrong. They specifically try to implement, but with varying degrees of success. Strong exertion/slave Fe can induce precisely the emotion desired in the individual; however, weak slave Fe is somewhat hit or miss, because one's confidence in the projection of the emotion is not what it could be. (by which I mean the person has lesser confidence in their ability to transfer emotion between: an ENFj can express all the enthusiasm they want, but do they have confidence they are being understood? That's a matter of slave Fe.)