Well, see the rest of the thread, I personally think it's absurd to worship only some selected sentences of the books and totally ignore the others, even though it's the same author(s) explaining their game.
Yeah, but most of use have now been playing the game far longer than he had when writing those words. The advice was written in 1981 - a mere seven years after D&D was first published. It is now just about 2022 - about 47 years after the game was first published. Indeed, 5e alone is now running on seven years.
The author was explaining their intent with their game, but many (indeed, probably most) of us now have more experience with his game, and games in general, than he did - we have our 20, 30, or 40 years of gaming to his 7 or so.
Which doesn't make what he wrote bad advice, but it questions the authority behind accepting that advice at face value. Maybe that advice needs to stand on its own, now, no matter who wrote it, or when it was written. And maybe people who aren't following that advice know something that he didn't really understand yet at the time of writing.