I realize my descriptions might be a tad bit offensive but my main objective is to get the main point across in the clearest way possible and to do that I need to forgo political correctness.
I used to think of the Id as just being used for own goals as well but this has left to many unanswered holes in the behavior of the types and thus I now think the Id plays plays a much more central role in the behavior of they types. My understating of socionics is constantly evolving (which is why I haven't subscribed to a type yet, I don't want to type myself until I understand all the types 100% and rid my viewpoints of stereotypes), I will also admit that not all my past comments have been 100% correct, so feel free to disagree, but currently I think model A is filled with unanswered gaps and doesn't fully penetrate the essence of the types.