Socionics doesn't deny that it deals with type relations, and that there are more factors to consider in real life. But information metabolism dynamics is still very important in how we connect and get along with people.The MBTI is sometimes considered inferior because it lacks a fully developed relationship model. But imo the socionics relationship model (ie, the quadras and duality) overreaches; it’s constructed on principles that are inappropriately a priori and it’s far from infallible—as is any type pairing formula for relationships, of which there are simply too many variations for a typology system to absorb.
There is no need to hold VI against socionics, it's not a part of the theory. Like with any model or theory, people are coming up with different ideas on how to connect it to other things according to their experiences. Some agree others don't, but not liking VI is not an argument against socionics.The VI method for typing that many socionics freaks swear by is also unreliable and almost comparable to police profiling if you think about it: the unpalatable notion that physical appearance and/or expression reflect character (or lack thereof), personality and ulterior motives. Both VI and the dual relationship model are applied in some of the socionics celebrity types galleries I’ve browsed, where some of the typings are downright preposterous.