I think even if it were more neutrally named it would still be less popular than Myers-Brigs because MB gives you an either or which gives you the simple [E/I][S/N][T/F][J/P] categories which maps to just 16 convenient categories where the Big Five tests spit out numerical scores ranking you relative to the population. The former lends itself to the kind of short in grouping and desire for fast categorization that keeps horoscopes popular, Myer-Brigs giving you ENSP is a clear group to belong to with all sorts of "what does it mean to be ENSP" articles to write, where the former doesn't really give you a clear concise slot to use it in. The closest would just be ranking high or low in each category but that's 32 groups and long to type compared to the 4 letter MB personality groups.
