This is my personal definition of Fe, which I want to share impressions and results. To start, let's define what Feeling itself is.
What is Feeling?
Feeling is a judging function which judges and makes decisions based on a desire of harmony between the Fe user, the beings that live there and the location. To feel that the environment is well taken, understanding and respecting all personal wishes and other's wishes is very important for a Feeler.
Because of this need of harmony, Feelers like to identify and follow a chosen set of values, principles, codes of conduct and rules and guide the Fe user to an appropiate behavior in the determined situation, so it enables harmony. This does not mean that a Feeler agrees and submissively everything that it is imposed to them as appropiate or good for establishing harmony. Feelers will consider and evaluate it. A Feeler can be very confrontational and opposing as well as fight people, groups and situations because it will not help to establish the desired harmonious environment.
The nature of this function is very subjective, if we define subjectivity as something related to the subject. Feelers like to know people's POV and how it affects and it is affected by the environment. This can also include animals, plants, etc, how they are affected and how they affect the enviornment.
What is Extroverted Feeling?
Extroverted Feeling (Fe) has its origin in everything that happens outside the self, which are people, places, objects, systems, values, thoughts, actions, etc. Therefore Fe is the judging function that judges and takes decisions in base on an analysis of principles, values, systems, and thoughts that people and the Fe user hold on a determined environment.
Fe also considers the own Fe user's position, the effect they have on their locality and how locality affects them, which makes them measure how positive or negative would a determined action of the Fe user is as well as how to put personal interests (that vary greatly from person) in action with Fe.
Which things are important for someone who decides using Fe?
It varies greatly. Depends on the Fe user, their environment, background and upbringing. We can't stablish a general set of things that are important for a Fe user, because its subjective nature makes it hard to.
For example, a kid with dominant Fe was taught in his house to value efficiency, success, tough competition, an aggressive and strong approach. Selflessness and friendship were secondary, even inferior and despised to this Fe kid. When this kid has grown up, he would behave cruelly, unrespectfully and harshly in front of people who percieves them as weak, losers or not so strong-willed and the Fe user will impose them subtely and directly to be like the Fe user. These valued things, taught in childhood, are put into practice in their localities so it brings what it is thought as harmonious for a good social and environmental (not in an ecological sense this time) setting.
To be a dom/aux Fe does not mean to lack personal interests, wishes and personal POVs which are wanted to be follow by the Fe user and others. But it means that they will find the best way to stablish harmony in their environment and people, being the "best way" something that varies a lot from people.
However, there are three important things that a Fe user likes to consider when using Fe. These are explained in the most outached way as possible.
a) Social Roles
Fe users like to know everyone's social roles and how these affect a determined situation. For example, a Fe user may see a secretary to be very distinct from a boss, as they have different qualities, good and bad as well as different ambitions. They will find the best way (again, it varies greatly) to deal with them and stablish the desired link to relate to both of them.
b) Group Affinity
In every situation, a Fe user will find how a person or social group works, what they support and stand against, and accordingly to the Fe user's judgement, will seek afiliation to them, to their values, thoughts and activites. Maybe this is why Fe doms are thought to be very gregarious and sociable individuals. Fe users can very well fight and stand against other people and groups which don't support what the Fe user support.
c) Social gestures/graces and communication
Courtesy, prudence, humor, thankfulness or sensitivity can be perceived as important to a Fe user because it makes easier to stablish an understanding of a person's personal situations and how they are affected. Unthankfulness, rudeness, coldness, disagreeableness and lack of respect can also be taken into account by a Fe user because it helps to make clear the unapproval of a person, situation, etc. It also helps to respond to said and unsaid needs as well to make them know our agreement or disagreement.
Some traits associated with Fe and my explanation of them.
a) Emotional sensitivity
Although it looks like, Fe does not guarantee a developed emotional senstivity or a deeper connection with your feelings. It is however associated because of the subjective nature of this function, which seeks an understanding of people, personal data and the environment. You can be an unsensitive and utilitarian manipulator who uses Fe to follow your selfish interests establishing harmonious environments which misguide people.
Empathy is the capacity to recognize other's emotional states and the circumstances that provoke it. A Fe user is not necesarilly empathetic, because emotional states aren't necessarily the main factor for making decisions, they may have other criteria like usefulness or integrity on other people. But Fe can help to develop empathy, because the social interaction that accompanies Fe can train you into recognizing emotional states.
Compassion is the emotional state that arises from another being's suffering, and motivate us to help them to overcome the things that causes suffering to the other being. Compassion can also be taught through Fe, for the same reasons mentioned with empathy, but it's not a guaranteed trait.