However, close cooperation and ironing out details is difficult, as partners can't agree on principles.
I think this is a key area of conflict that has a difficult time disappearing during a relationship. Each other thinks that they could function a lot better if they changed their attitudes and principles in different areas of life.

In my experience, communication is also at odds, because you still communicate through ego ~ super-ego functions. Essentially, each one wants the other to react in a certain way to the information to put forward, but each one feels the feedback and other information the other person gives doesn't lead anywhere or conclude anything the person wants. Sure, each person makes up for each others weak functions, but in general, the person really doesn't care one way or the other about what the other person is making up for in the relation.

I think I am going to need to re-write that.