Umm… I continue to be confused by your responses here. I started out asking what I thought was a straightforward question about your essay: why seven? And I still don’t know.
If you want to hear my thoughts on how I (or another condensed matter physicist) might communicate about states of matter, that’s a different issue. It’s an interesting question that I can try to answer, but I’d like to understand first why astrophysicists might use the term differently.