As a said in another thread: the Wall gets censored (for lack of a better word) out of SCAG, presumably to avoid hurting somebody's feelings,
Whatever, WotC deciding to withhold lore details in a book doesn't change anything, anyway. The lore stays the same. Wasted opportunity on WotC's part to expand the Wall's lore and make it better, more interesting and developed. Instead, they swept it under the rug, hoping "the new generations" of D&D players and DM won't be interested enough in the lore to find out about it.
I have been playing D&D since 1980. My memory may be hazy, but the Grey Box Forgotten released in 1987 made no mention of the Wall.
The Wall was added as a concept by the god awful books...The Time of Troubles.
Personally, I was disgusted by the notion that some 3 part fantasy series of dubious quality should automatically make changes to any and all Forgotten Realms campaigns.
I have never acknowledged any aspect of The Time of Troubles in any game that I have played in, and never will. New Generations of players
should absolutely learn about the TSR period where fiction book sales dictated game design and mechanics, and reject the whole period.
Also, in Russian History, there is a period referred to as the Time of Troubles, it is when the Romanov family ascended to be Emperor.
D&D designers are typically ignorant Americans..(so am I


)
so the plagiarism of the name given to
actual historical events in the aforementioned FR series might have been completely unintentional. Perhaps the designers in the TSR era were unaware of the usage of the term
the Troubles, to refer to a period of North Ireland history.
In a modern American context if you refer to a fictional "The Wall", people think you are talking about Game of Thrones.
Losing The Wall from the Forgotten Realms, is like removing grime from a Masterpiece painting, it is
restorative.