I understand what you are saying, but I disagree with your arbitrary categorization. The question at hand is productivity and release schedules, not your personal product preferences. "Moving the game forward" is an arbitrary, ambiguous standard. Books with rules being rule books, and products being products, are more grounded terms to make real comparisons. This is in fact the opposite of nitpicking, such as discounting one category of rulebook because reasons.
I understand that you do not like Setting books, but books like Guildmasters Guide to Ravnica or Rising from the Last War have tons of rules material, hence being books with rules, or in one word, rulebooks.