I definitely can't speak for all others judgers, but I know for me, as an Si user, uncertainty is often a very threatening thing and one of the tougher things to deal with.^^ This ^^ Again and again. My husband is an ISFJ. The number of times he thought I was arguing a point but I was just asking a question. It's amazing. You can ask me all manner of questions and I won't think anything of it. He assumes I'm being passive-aggressive because his mother is very passive aggressive. I have to give a long explanation before he gets it. Oh well.
Sometimes I argue for shits and giggles. But their short lived and the tone is lighter.
Even though it varies among types, I've always found it fascinating when I read about the basic J vs. P difference. The main idea that has stood out to me is the idea that Js are stressed out by things being undecided and up in the air, while Ps are stressed out by the idea of things being pinned down in place. It's so interesting to me how the thing that comforts a J stresses out a P, and vice versa.
So as a dom Si user myself, I think sometimes questions come across as threatening because they seem to throw doubt into the mix of something that is already in place. For me, I always want to be able to trust and rely on some things, to know that they're right and that I don't have to worry about them changing. When a question pops up, it can sometimes feel like someone is looking to change it.
Now, this certainly isn't always something that bothers me. I hear questions every day and tons of them I answer happily or enjoy thinking about. And sometimes even though questions are uncomfortable, they can lead to necessary improvements.
But I think Si is sometimes foreign to other types because it has such a strong desire to pin things in place. The notion of the idea of "questioning everything" is very unsettling to someone like me and I could never live my life happily under that philosophy, because I do have such a strong need for trust and reliability. I certainly think traits like dependability and responsibility are good things.
But I also think that for me, it's interesting seeing how my other functions play into things as well. My Ti often leads me to not being able to make final decisions on large scale topics. For example, I am very often in the middle concerning political topics because I always feel like there are more facts to be uncovered and I can't make a definitive decision on either side (which seems to be very different than how both Te doms and Fi doms tend to feel). So it's interesting to see how my Ti can lead me to be more perceiver-like.
I agree with you since the functions do often result in conflicts...an INTJ and ISFJ have completely opposite functions, for example.it depends on the other 3 letters as well. Just the J or just the P is too vague. You´re a P if your first or second function is Fi or Ti. So the J/P difference alone doesn't give that much information. You need the other letters as well.
However, there's always some form of variation when it comes to type anyways. An INTP and an ISFJ have the same top four functions. In some cases, INTPs get along great with ISFJs. In others, INTPs have more conflicts with ISFJs than INTJs do.
So there's generality in everything anyway. I still think it's ok to just think about what different people think about Js or Ps as a whole.