You are looking at this too simplistically. You assume that he doesn't understand the differences between Si and Ni, but he is restrained because he can only speak about generalization of behaviour here. He is generalizing behaviour that is a result of being dominant in the two different functions, but obviously having a certain dominant function doesn't guarantee that any behaviour one would associate with it will be displayed.
Several of his comments go against what I've seen of my fellow INFJs. It sounds like he either doesn't have enough experience with the type or is generalizing and simplifying too much.
Mainly what I had an issue with is that he is making a rather simplistic assumption that Jung's Sensing equates directly to sensing. This supports all his following comments on INFJ/ISFJ differences, such as that INFJs are more clumsy than ISFJs, that they are not as interested in trying out new foods, and not as prone to body dysmorphic disorders. Thus my main issue with this video is conceptual rather than behavioristic i.e. I do not agree that one can equate S to sensing in such a direct manner.
... but he is restrained because he can only speak about generalization of behaviour here.
There is nothing preventing him from talking about these differences in more abstract terms rather than simply listing behavioral differences.
He is generalizing behaviour that is a result of being dominant in the two different functions, but obviously having a certain dominant function doesn't guarantee that any behaviour one would associate with it will be displayed.
He shouldn't equate functions to behaviors, period.
Overanalyzing past interactions is not the same thing as nostalgia.
People of many types experience nostalgia. This is common to human experience rather than some specific MBTI type.
He doesn't claim at all that INFJs won't enjoy trying new foods, just that it's more likely for ISFJs to enjoy it, and to enjoy it even more.
And how does he know that an ISFJ enjoys food more than an INFJ?
I was roommates with an ISFJ girl who suffered from anorexia whenever she experienced anxiety. Her relationship with food was clearly less than enjoyable.
Just because he says ISFJs are more likely to be body-conscious, doesn't mean INFJs are less likely, or that INFJs can't be better at it.
If he states that ISFJs are
more likely to be body conscious that automatically implies that they are more conscious of it than INFJs.
You have to ask yourself a question here "Who are ISFJs more conscious than?" the answer is other types including INFJs. But then again, dysmorphophobia has nothing to do with type and can affect girls of various MBTI types. So again his comment is misleading.
By body-conscious, he means it in a different way.
He does not say anything of this is your own assumptions.
Si results in conscious focus on the internal body state.
SOME INFJs have a good sense of their physical bodies, but come on... I know tons of INFJs, and they are among the clumsiest people I know
Ahahaha! Tell that to my dance and Jujutsu teachers, that I am the clumsiest person that they know. They'll slap a modicum of reality right back into you.
It sounds like you've been typing clumsy people as Ni-dominants.
so to compare their skills to the average Si dom who has been developing Si their entire life...
You make the same mistake as the creater of the video above -- equating Jung's S functions to sensing and thus inferring that any N-dominant must suck at physical coodination and thus sports. You'll be disappointed to find out then that there are several N-dominants competing in the Olympics. So much for the famed clumsiness.
And also, the type of physical skill you're describing with the INFJs is different. You are describing skills that are more associated with developed Se.
The creator of the video above hasn't mentioned anything about their skills being different, so once again this is your own assumption.
