Scale degrees

So, Ive reviewed the accompaniment lessons in LOAs 2&3 and have a question re the naming convention. I get that all diatonic harps are intervalically identical (with some nonstan exceptions) and that standardizing on the C for discussion purposes can be useful. However, using the note letters off the C harp when discussin an other harp seems as it could be confusing. Wouldn’t it be better just to speak in term of scale degrees instead? It seems to me that this would be more neutral And universal.