To borrow terminology from the Area 51 site, I think in general we will want this site to be aimed at a "Avid Enthusiast or Prosumer" (as poorly as that applies to this site) - not because those who know they are "beginners" at interpersonal skills don't belong her, but because we'd love for everyone who is a part of this site to quickly learn skills and gain confidence so that they would soon feel as though they are "prosumers". It would be fantastic if this site really will help people develop good human interaction abilities.
Becoming a "prosumer" like that is more than just skills - we all need non-skill knowledge as well. We need to be aware that people think differently. We need to know that some people have brains that process their life differently to others - that some have Asperger's or Autism, and others are so-called "neurotypical". We need to know that while communication can sometimes be slightly difficult between those with ASD or those who are neurotypical, and that that difficulty goes both ways, neither prohibits the possibility of good conversations, good relationships, and healthy social lives.
We need to know that some people have personality disorders such as narcissistic personality disorder. Being a "prosumer" of interpersonal skills doesn't mean you're a qualified psychologist or counsellor, but it does mean being aware that personality disorders exist, knowing a couple key characteristics, and knowing how to encourage people to get help from professionals.
Being a "prosumer" means helping those who come to this site by being able to categorise certain behaviours and giving them the commonly used labels. It means being able to identify when someone might be "gaslighting". It means recognising "victim blaming".
Being a "prosumer" means having a well-rounded competency in the area of interpersonal interaction, and it is impossible to have such a well-rounded competency without knowing the language of the field. To reuse phrasing I thought up for another site, we want this site to concern both the theory and the practice of interpersonal skills. So questions about terminology fit into this site because they serve that goal: well-rounded competency.