First, I don't have any opinion on the scope of the site focusing on communication - no agreement, no objection. However, I see that many arguments on various topics about the scope (e.g. https://interpersonal.meta.stackexchange.com/a/2205/86 ), and I think whatever people's arguments are, as long as this site is named as "interpersonal", their answers will always and inevitably be shaped by their understanding of the word. This is purely the linguistic/cognitive problem, and we would be wasting time arguing if we don't have a clear, indisputable definition on "interpersonal".
So what are the definitions of the word?
- Oxford: Relating to relationships or communication between people
- Merriam-Webster: being, relating to, or involving relations between persons
- Cambridge: connected with relationships between people
- Macmillan: involving relationships between people; interpersonal skills (=the ability to create good relationships between yourself and other people)
I see most dictionaries don't include "communication" in the definitions. Sure, the scope of the site is independent to the dictionaries and can be make clear in the tagline or help page, but does this have any problem?