Also this:
Does not describe a Relationship Story Throughline. The Domain of the RS does not describe the “Domain” of their argument but rather the kind of conflict felt within a relationship—in this case a friendship. Not once does their status, or reputation, or social standing somehow impact their feelings towards one another.
Your last sentence about Tony wanting Steve to adapt and Steve refusing to change—that defines a relationship challenged by an inability of two manners of thinking to coexist and co-create. The inability for their relationship to grow and mature is the very definition of a Concern (or lack) of Changing Ones Nature.