... I am saying, as an expert, myself, that studying openings before 2000 is utterly meaningless. ... u2000 players don't have a firm enough grasp on chess that being supremely booked up matters. Toss that out, ... No deep opening knowledge needed.
Where did someone advocate "being supremely booked up" and having "deep opening knowledge"?
... play a basic system (for me, London with white, Philidor/Old Indian set-up with black) ...
If one is going to play (for example) the London System, what would be wrong with playing over some of the examples from a book with annotated London System games?
... Books are written because they sell, not because they're appropriate. ...
Is selling perhaps easier for books that are not denounced as inappropriate?
... you asking whether it's harder to sell opening books due to there being so many recommendations against studying the opening. ...
I was not asking that. I would not make any reference to "so many recommendations against studying the opening".
... you suggesting non-opening books are easier to sell. ...
I was not intending to suggest that. I was trying to suggest a possible motivation for writers and sellers to aim for the appropriate.
... Re-read #32 this is where you make that suggestion.
My post #54 (like your posts, #47 and #60) reproduced #32, and it is reproduced again above, enabling anyone (who cares) to decide for themselves what #32 does and does not suggest.
(I'm not saying you believe, it, I realize it's just a throw away hypothetical.) ...
In your post #47, it did not seem clear to me that you regarded yourself as having only a hypothetical notion of what I believe. Consequently, it seemed appropriate to me to notify you (and anyone else who might be following the discussion) that
"I was not intending to suggest that" non-opening books are easier to sell,
and that I WAS "trying to suggest a possible motivation for writers and sellers to aim for the appropriate."
Let's be entirely clear in that quoting masters is not a definitive argument. There are many masters, and not all of them agree with your viewpoint. Now, I am saying, as an expert, myself, that studying openings before 2000 is utterly meaningless. I am dabbling a little bit now because I'm stagnating somewhat, but before 2000? Forget about it. u2000 players don't have a firm enough grasp on chess that being supremely booked up matters. Toss that out, play a basic system (for me, London with white, Philidor/Old Indian set-up with black) and work on the middlegames of said systems, work hard on endings, do a lot of tactics, and play 960 to strengthen your knowledge of unfamiliar positions. It took me just over 3 years to go from 800 to 2000 (OTB, of course) that way. No deep opening knowledge needed.