I've often heard that Campaign Dungeons were on the way out by the time EGG was working on AD&D. Recently, two things have made me come to question this idea. One, which I will post on later, is the advice for dungeoneering on page 107-109 of the PHB. The other is this line in the Monster & Treasure Assortment Sets 1-3. Emphasis mine.
"... these assorted monsters and treasures are aimed at making the DM's task a lighter one when it comes to readying the major dungeon in which most of his players' Underworld Adventures will take place."
Based on the copyright date on my copy, and a quick Google search, I believe this was published in 1980, making it one year after AD&D. Someone will no doubt correct me if this date is erroneous. It is interesting to me to see that this idea was still present, and indeed assumed, during this time even though some internet commentators have said otherwise.
Not really that revolutionary of a post, but it sort of stuck out at me tonight.