Reddit answers the question: why does the "G" string go out of tune first?
The short answer is that the writer likes this gauge set:
10, 13, 19 plain, 30, 44, 52
§Remember, Looming Productions. Studio C. You know, for rehearsals.
§I kind of dig this record "The Sand" by JP Haynie. Listen for free or buy a download. It's all good.