It says that Te dom are afraid to be weak. But I've noticed a lot of xxFJ also express that fear. Especially ExFJs, they want to be capable and strong. One of my friend (ENFJ, male) say that they dislike feeling weak and feel shame if they didn't push themselves enough to solve a problem. What could explain that mindset that if FJs don't have Te-Fi? More importantly, is it possible ExFJ mistype themselves as ExTJ for that reason? Bc they see themselves as strong and confrontational?
As far as I can tell, the main problem is that you are oversimplifying. There are two aspects to this problem that often interfere with the type assessment process:
1) The tendency to stereotype and overemphasize superficial characteristics: This is usually a result of not understanding the distinction between cognition and behavior, which is the first major principle covered in the Function Theory Guide.
Two different types can exhibit the same behavior but for different underlying cognitive reasons. For example, there is a common stereotype that portrays ExTJs as leaders/managers due to dominant Te. Yet, in reality, ExFJs are equally likely to gravitate to leadership roles. How are you going to explain this in the absence of Te? Is Te equal to leadership or does Te have a monopoly on leadership? No and no.
"Leadership" is a behavior. A behavior can arise for many possible reasons. Te doms might gravitate to leadership due to a desire for order or control, whereas Fe doms might gravitate to leadership due to a desire to influence and improve group cohesion. The "leadership" behavior may look similar on the surface, but the cognitive reasons/motivations underneath it are vastly different, because Te and Fe are very different functions.
If you don't properly distinguish cognition from behavior, you won't have a deep enough understanding of WHY the behavior exists, and then it's very easy to be led astray by superficial stereotypes during type assessment.
2) Overlooking context and circumstance: This is usually a result of not understanding that human beings are motivated by a multitude of factors, and personality type is only one of them. Most human behavior is multifactorial. Before you try to attribute a behavior to a particular type/function, have you made sure that other external factors/causes have been properly accounted for?
Why is it that, compared to other types, ExTJs are more likely to have this quality of being "afraid to be weak"? It is directly attributable to inferior Fi. However, this doesn't mean there aren't other factors/causes behind it. Another factor that could be at play is general fear of vulnerability, which can afflict anyone of any type. Fear of vulnerability isn't mainly a matter of personality but of negative experiences that hampered ego development, though it might also negatively influence function expression. Most people operate at lower levels of ego development, so fear of vulnerability is a widespread issue, to varying degrees.
In the case of ExFJs, Fe not only encourages one to harmonize with prevailing social norms and customs, it also encourages one to actively maintain and enforce them whenever one observes behaviors that go against the norm. This is one reason why Fe doms can come across as strong-willed, confrontational, even meddling.
However, there can be many other reasons why they come across that way. For instance, ExFJs who have grown up in very harsh or hostile environments might constantly be faulted or shamed for "oversharing", "oversensitivity", or being "overemotional". When healthy dominant function development gets inhibited by powerful environmental factors, it can have a negative impact on how a person expresses all of their functions. People don't only use one function, so Fe isn't the only function to consider.
For example, since environmentally oppressed ExFJs can't really use Fe in a positive way to influence and improve the social environment, they have little choice but to use it in a negative way to conform with the very norms and customs that denigrate their natural Fe strengths. Instead of using Ti in a positive way to encourage healthy boundary setting and reasonable decision making, they have little choice but to use it in a negative way to obsess about "strength", "competence", "independence", or "intelligence", because that is the only means they know of avoiding shame and obtaining validation.
In short, can you tell the difference between natural function expression (positive) and compensatory function behavior (negative)? You won't be able to tell the difference until you understand the complex relationship between personality and environment.
As I wrote in the Function Theory Guide: "To really understand someone, you must contextualize their behavior, by examining all the different forces that might be motivating them." Human psychology is complicated, which means there's always more going on beneath the surface than you realize. If you think type assessment should be a simple process, you're likely to suffer a high error rate.











