I've never had much time for the Reinin dichotomies except those few that perhaps explain things in ways directly understood through the information elements and Model A.
This has most probably been discussed before in a thread I've missed or not cared to read due to being overly convoluted, but I thought it would be interesting to look at the ways that duals match with each other according to the Reinin dichotomies. According to them:
duals share the same Reinin traits in:
carefree / farsighted
yielding / obstinate
democratic / aristocratic
judicious / decisive
merry / serious
process / result
they differ in the follow traits:
dynamic / static
tactical / strategic
constructivist / emotivist
positivist / negativist
asking / declaring
an individual differs from their conflictor in the following traits:
positivist / negativist
judicious / decisive
merry / serious
process / result
It may be inaccurate to say that your dual aids you in the traits they have but you don't because it could still be that even in shared Reinin traits they are assisting you in information elements that you are weak in.
However, if you are looking at the Reinin dichotomies in isolation as a passing interest, "independent" from Model A Socionics (although it isn't really), then it perhaps says things about patterns of behaviour you like and dislike.
e.g. if I am a EII:
I will wish for a dual who shares the following traits: farsighted, yielding, aristocratic, judicious, serious, and process.
I will need a dual who aids me in the following traits, which I do not have (in theory): dynamic, tactical, emotivist, negativist, and asking
I will find the combined following traits (which my conflictor has but I don't) unattractive: negativist, decisive, merry, and result. In addition, they share with me the following traits, which combined with their style, I probably find unattractive: static and constructivist.
I think with many, if not all traits, it is difficult to determine which you are due to problems with determining which areas of action and timescales are important. e.g. it is quite possible, maybe even natural, for a person to be a long-term positivist but a short-term negativist.
Looking at the traits I share as well as the ones in which I differ with my conflictor in this way, it is easy for me to see why my conflictor rubs me the wrong way in the how they act. Their mood is different or similar in exactly the wrong ways! They are quick to act in entirely the wrong manner altogether, and slow in the things in which they get right. They may even be prone to acting in ways similar to my own at some levels, but in ways in which I despise in myself.