In order to learn Socionics at all, you HAVE to learn the functions, you can't go by the dichotomies like MBTI. Those who do will just end up with MBTI type descriptions... Which are not the same as Socionics ones.
It's possible that I'm just come from an old MBTI perspective. I looked through MBTI rigorously until a couple years ago, it might be more of a thing to look into the functions. But all the message boards and forums I went to barely ever mentioned MBTI functions, and based the types off of the dictomoies.