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Economist I don't disagree with what you're saying... but I think what you're describing is creative-Fe, and hence you're probably a creative-Fe type...
Fe is about focusing on the other person, other people and how they feel about you. Fi is about focusing on yourself and how you feel towards others. You seem to naturally have more focus on others.
I'm not saying that Fe doesn't value group harmony, they do (btw, I think I'm more talking about Fe-creative). It's more that Fe gets... dissolved in a group, because there's so much Fe information being transmitted. But I don't think the basic principle of Fe gets changed in 1 on 1 or in a group. It's not as if how Fe works can suddenly "change". It seems ridiculous to think that there's something that somehow separates "1 on 1" and a "group", like Fe can tell somehow. So I see Fe as more like a module... There is 1 Fe, which is 1 person's Fe. But if there are many people, then more Fe's get stacked, and there are many Fe's... But the basic principle of Fe would be the same, which is that you make decisions based on the others' emotional states.
It's like this... there are 10 people in a group. And Fe is reading all the emotional states of each persons individually. It's like "Oh, here's this person who got his feelings hurt, I'd better say or do something to make up for it" "Here is this person who is not feeling welcome, I'd better try to make him/her feel welcomed" "Here is this person feeling tired" "Here is this person who got offended by something Person A said" "Here is this person who is angry for some reason" etc etc. But the basic principle of how this work is no different whether it's 1 on 1 or in a group. It just means that there's more information flying around, so it becomes more complex.
At 20 people, things become more complex, you can't keep up with all so you'd probably focus on just a few people. At 50, 100 people, it would become virtually impossible to focus on individual emotions, so you'd focus on "general feelings/direction of a group". At large numbers, people rarely act individualistically.
I see it as more as achieving a kind of homeostasis... an emotional equilibrium. A Fe user is basically trying to optimize your emotions in some ways. Feeling sad? Here, be happy, because everybody wants to be happy. Fe is also trying to "awaken" emotions in you, because they see lack of emotions as disturbing, something abnormal so it's something that should be brought attention to and be awakened and shaken up.